Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba206f9a19b6b67…

MALICIOUS

PDF

35.1 KB Created: 2020-11-06 02:33:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ebbd08f1fcb932eb367d013c5ed4250 SHA-1: 1efe8e0ab33a5c09360a3565c451b4aa71b6db86 SHA-256: 4ba206f9a19b6b67f6436e4659b05b10f831e8fdfdfc3d0d6cbaab995905aba7
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. One of the primary links points to 'https://traffnew.ru/123?keyword=bishop+guide+maplestory', suggesting a potential SEO spam or phishing lure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the sheer volume of outbound links indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/123?keyword=bishop+guide+maplestory
    • https://liwifaxuje.weebly.com/uploads/1/3/0/8/130874244/09692e5c.pdf
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/pemuvavekenurikamik.pdf
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/6922800.pdf
    • https://nexajatolotol.weebly.com/uploads/1/3/4/3/134308242/satojupafo.pdf
    • https://jinafoxel.weebly.com/uploads/1/3/4/5/134597088/xunimakilafe-jepuridobelafol-tibapumaz-xumugipegodav.pdf
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/5116290.pdf
    • https://saloramorolo.weebly.com/uploads/1/3/4/3/134307331/9693849.pdf
    • https://cdn-cms.f-static.net/uploads/4409256/normal_5f9b63d718dbe.pdf
    • https://kuromazu.weebly.com/uploads/1/3/2/6/132695519/mevomubed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/addbeb6f-598e-4dab-a5b5-8d684acc98e9/nedisuximubuna.pdf
    • https://uploads.strikinglycdn.com/files/101030d5-c9da-4673-808b-d7ddb431d34b/walgreens_humidifier_not_producing_mist.pdf
    • https://uploads.strikinglycdn.com/files/36fc2d77-f72b-4cbd-8933-bdc2e2ea92ff/cnc_programming_classes.pdf
    • https://uploads.strikinglycdn.com/files/9ef1958c-7346-42fc-9358-7488cb5f6df2/29322644471.pdf
    • https://uploads.strikinglycdn.com/files/11f4bdea-731d-4534-b9b7-849982b2d3cd/zavugure.pdf
    • https://uploads.strikinglycdn.com/files/dddbdfc9-4636-47ae-8f33-f93c8ec0e601/warhammer_fantasy_wood_elves_army_book.pdf
    • https://uploads.strikinglycdn.com/files/2f77f12c-24ee-4cbe-92ee-fb283f660d20/the_most_dangerous_game_active_readi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ae9.bin
9505cbb995f41e2f4fb51208a8d39495330c81e0d17388821837905cd4ae7d62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AE9 5524 bytes
font_01_sfnt_off00005d8c.bin
c8651ec6783e0fd76e815da62579ab2d443b636884d5bc2b568db9e33470e46f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8C 10024 bytes

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