Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7d071462964756…

MALICIOUS

PDF

48.2 KB Created: 2020-10-26 17:43:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ec065e2eab26f22758d3c9d5b0c2af71 SHA-1: 9be2102f72ec4f0259883e2aca0dba1eeedfb10a SHA-256: 5b7d0714629647567a47a1cd89380953bcae7a2d3a6b23732e246b0e6a12bc3e
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at 'https://cctraff.ru/aws?keyword=cambridge+advanced+collocations+pdf'. This suggests a phishing or scam attempt, likely delivered as an attachment. The ML classifier also strongly indicated maliciousness.

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://cctraff.ru/aws?keyword=cambridge+advanced+collocations+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376096/normal_5f915f6f1d5f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387219/normal_5f9621ee80308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378613/normal_5f8f6b378ebe2.pdfIn PDF document text
    • https://texitanoz.weebly.com/uploads/1/3/0/7/130739996/4925581.pdfIn PDF document text
    • https://pasuliwipo.weebly.com/uploads/1/3/1/4/131452824/fibidufowanomulowa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/ditiruz/rijazedukav.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/subujozifakiful.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/goxenuxowifobu.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/ripuwisad.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/the_four_loves_by_c._s._lewis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2235e40f-2368-4030-92c4-fbf3c07ac583/filegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8b1597a-25f5-4c24-a8e9-a91d1869c75a/gixaveluw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b17a4b36-6044-45c1-b68f-df3b1819d96d/zilini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b20e842-4e3e-46fa-b805-318681b867ad/fowovodumepejiwodokojomow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b7bfee1-8791-48da-8b84-f8e447593dee/8158019543.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/kajivabufefipilugus.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/32375783755.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/lexan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3906/4225/files/safety_1st_guide_65_convertible_car_seat_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7696/6808/files/bowflex_xceed_instruction_manual.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D1E 5488 bytes
SHA-256: f3a5cda11bbbb19a0b7fad8bbed2190831759e1c50600e0765e50496743360a3
font_01_sfnt_off00006fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB1 3720 bytes
SHA-256: 40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b
font_02_sfnt_off00007b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B13 13360 bytes
SHA-256: 9bc741af2d2e0a59436b775e4c1636a776c1aa3f5cca927d6ff1c67bd501fd38
font_03_sfnt_off0000a4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4D1 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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