Malicious PDF — malware analysis report

Static analysis result for SHA-256 042126ae1a2805dd…

MALICIOUS

PDF

81.6 KB Created: 2020-10-29 01:34:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: eaf1f9ef7274ae6f4bee8b84bbf26f76 SHA-1: 326a558f5fbaffbad14a25a4a71d5d6dc4dc6dd9 SHA-256: 042126ae1a2805ddccbe3490d7fb6b0e05a3f10b13cc8d2640fa8c4ee62af233
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure at https://cctraff.ru/strik. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and identified malicious URL point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/strik?keyword=2020+eid+ul+adha+date In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366347/normal_5f87d6608fe66.pdfIn PDF document text
    • https://xojisige.weebly.com/uploads/1/3/1/6/131637148/1441719.pdfIn PDF document text
    • https://nunezexivu.weebly.com/uploads/1/3/4/4/134440215/lezukeguk-kimimol-zepuzeguri-jafuwokug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5f8860b9eadcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369794/normal_5f8b509d1edc3.pdfIn PDF document text
    • https://worozimovazez.weebly.com/uploads/1/3/1/4/131406108/rikomu_maxenodepomeze_felasejovibet_fosawekulinez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403936/normal_5f9228a1d1f23.pdfIn PDF document text
    • https://jopalezaleloloj.weebly.com/uploads/1/3/1/3/131380469/3202815.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/mofep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/9429/1633/files/23844145422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ca5fc96-813d-4c8e-b223-4a7c05a4ab9e/29418323256.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9abb2a89-4b97-4a02-915d-271498c04c24/57299347681.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2132/8807/files/media_player_lite_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc0c49aa-7760-4692-a846-db50e1062e13/9529493865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e13679da-0924-4d07-acb8-e73d451f9bfa/62010059565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/945c2180-e19d-4f46-89af-95df1c09b1ea/macbeth_act_3_reading_and_study_guid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61888b1d-4691-49df-bf0f-6fccb4f31287/titilusofikupeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1ec606d-8f8b-4840-a20d-5e8d50a794eb/3044125818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd7dca1e-a309-41e3-98c7-1f49b4312c6e/3802867052.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfa0d57a-a3f4-4ed2-8fc9-973848abb1ab/48835872756.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b719949-35a4-4f0c-8bfa-fbbf64bba390/deneranipinirarop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31e0f340-8b5b-4641-9af7-5c3ca0b0d462/mewibofilijo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7981/0206/files/.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3729/7304/files/sumuxer.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off00010466.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10466 21684 bytes
SHA-256: 9b37bb2cb06d0e465e65e5b49b4b3a5c29e29517e9abadd6a0f7a537787acdb8
font_00_sfnt_off0000ac53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC53 2888 bytes
SHA-256: a34f6133241b0e53c3cfe1f853016e916a3d7180b6d3b88390408fd04f35e9f6
font_01_sfnt_off0000b697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB697 4816 bytes
SHA-256: 93e94e4b67f4a0e21b1bfb36f0e28edd7285d82bf9c9f336857924ddc8f70ca6
font_02_sfnt_off0000c6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EB 5096 bytes
SHA-256: 0fe143c3d17d30f0942e0e55b10db5c3b1bcbb8bdab738371be7fd3b4c8038d3
font_03_sfnt_off0000d75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75C 15644 bytes
SHA-256: 7c773a6f6b7a9d3ca7fab0be951a6a90bbbc868a5e206100f1e36d4f759fc804
font_05_sfnt_off00012963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12963 3560 bytes
SHA-256: 778fba6a0fd3d3b8ceaf9ab7cfbc84ec3fab3a6e12439ada70dea4a087753dbd

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