Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2e13f8da4be756…

MALICIOUS

PDF

52.6 KB Created: 2020-08-25 09:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd4990d70cb7bacb7ece7eaac578f57f SHA-1: a7ac1d5c212e9a09d1e13eaa804774eee4a267ea SHA-256: 4f2e13f8da4be756f12bb49be9149eddbd030a7e62de20b668e65c350bb81379
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a malicious redirector link that is disguised as a vehicle manual. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the link leads to known malicious infrastructure. The PDF_SEO_LINK_FARM heuristic indicates the document is part of a larger link farm, likely for SEO poisoning or distributing malicious content. The ML classifier also strongly flagged this PDF as malicious.

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://ttraff.ru/pify?keyword=chevy+traverse+2012+manual
    • http://files.litvaklab.org/uploads/1/3/1/4/131438583/f72229.pdf
    • http://ranut.projbridge.org/uploads/1/3/1/8/131872203/guget-vixaxutaxajukak-nimebedas.pdf
    • http://files.national-energy.us/uploads/1/3/1/3/131379498/jatidovola.pdf
    • http://files.punchlinemarketing.com/uploads/1/3/1/3/131380008/b582e96c8.pdf
    • http://fiwitibok.shindigpublishing.com/uploads/1/3/0/7/130775388/1906585.pdf
    • https://cdn.shopify.com/s/files/1/0462/6812/1237/files/timimojuxoririza.pdf
    • https://cdn.shopify.com/s/files/1/0430/2071/4137/files/89882626047.pdf
    • https://cdn.shopify.com/s/files/1/0428/6310/0070/files/89663442311.pdf
    • https://cdn.shopify.com/s/files/1/0439/8045/6094/files/xadapesizufozap.pdf
    • https://cdn.shopify.com/s/files/1/0429/8119/5927/files/75682039846.pdf
    • https://cdn.shopify.com/s/files/1/0432/4111/1716/files/80807433496.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sivezijikok.pdf
    • https://cdn.shopify.com/s/files/1/0434/7628/7648/files/70471985001.pdf
    • https://cdn.shopify.com/s/files/1/0431/7066/0508/files/present_perfect_spanish_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0440/1017/6662/files/game_dev_tycoon_ios.pdf
    • https://cdn.shopify.com/s/files/1/0435/2121/2570/files/vafaninapusakuwezimuvimem.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/1-_99_hunter_guide_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0429/9217/3217/files/wetovatudumaxa.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008f42.bin
acd21364b5ed3d220481c8606ef6e3a0a633b716601420edfbfc422c34400c81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F42 5320 bytes
font_01_sfnt_off0000a13c.bin
268e2a6d6fe64e564e831691614d1960d0366b75d9e3a76ba3a6ecc4945510e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA13C 10636 bytes

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