Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72fdcf3d80663ba…

MALICIOUS

PDF

48.0 KB Created: 2020-10-25 20:03:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e252322623e6d4275bfca0f86d4fb3a6 SHA-1: e3947d1e27b07ce7030a30e4179d2ec120e86648 SHA-256: f72fdcf3d80663ba4d9d54b608a9e3f6cb8ea403fb7762ddeab1211c92ecb5cf
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm designed to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the malicious redirector URL, which likely serves as a gateway to a further stage of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://ggtraff.ru/aws?keyword=baf%25C3%25B6g+ausbildung+antrag+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366308/normal_5f89577b7318c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388283/normal_5f958f2523c53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366645/normal_5f897c710c363.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374536/normal_5f895e4fafa87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366400/normal_5f871a1370804.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385030/normal_5f915fe26a7a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_5f87870b98178.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/bararifozuv.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/xopevu_vilugarokobijos_fimorekon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2964e98e-3142-422f-b132-a36e5b592634/nuxajiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d749069-86da-42ee-be4e-c71f83e33c0c/39878062528.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10bdd18e-a46b-46ae-8754-b41b6d1404c4/xafifubatag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/5277/5604/files/miui_10_android_9_redmi_4x.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2335/4021/files/stardoll_stylista_hile_apk_indir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4548/5725/files/43125475753.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6383/1459/files/72377283803.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/4563/8303/files/download_talking_tom_2_hack_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5e56572-e939-400b-9651-3ef39b988366/esl_worksheets_for_beginners_vocabulary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da65a3c7-0f61-473e-872e-7e2a030b9924/gudigisunozugilatujuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0614b6ab-28d5-4470-8566-201552017d4c/zanipujupiletinivojap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd49acb9-16b4-4fd3-af70-7ac7e12ec50f/56955225411.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/785b78e3-106d-48aa-bef7-715690d3c35c/23511021120.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000779e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x779E 5536 bytes
SHA-256: eaf951fb885f8dcb7b521dc7f7303b9199248b16b203b610eea35520ba62481d
font_01_sfnt_off00008a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A39 11520 bytes
SHA-256: 7d768a99c6afece3bbbd50cee19a208ade8779559fd88d255fdb22449806bd19

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