Malicious PDF — malware analysis report

Static analysis result for SHA-256 00092ec0c974ac02…

MALICIOUS

PDF

33.7 KB Created: 2020-08-18 21:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b8c9dd97ade7b50d88ee92301fdbaac SHA-1: 0f7fbdd37713f514a2ca755d2b7dce63f4650be1 SHA-256: 00092ec0c974ac0258ccb952ed6209def139b9d3318657fcecfecd0894f6baba
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://ttraff.ru/pify?keyword=forming+questions+in+english+worksheets+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the malicious URL and benign-looking PDF filenames, likely to mask the malicious intent.

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=forming+questions+in+english+worksheets+pdf
    • http://files.daphnefatterphd.com/uploads/1/3/0/7/130775280/kikorozodegab-xelixi.pdf
    • http://zojan.dglivestock.com/uploads/1/3/0/8/130874422/1747158.pdf
    • http://files.healthsanitylife.com/uploads/1/3/1/4/131438241/zutis-kojep-delinobujus-nomixiwazev.pdf
    • http://files.adrianrigby.net/uploads/1/3/0/7/130775969/1760277.pdf
    • http://files.jenniferbetteridgephotography.com/uploads/1/3/1/6/131637385/buvijefefivovuw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/4922/0256/files/bugoxo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1053/1238/files/warfarin_guidelines_uk.pdf
    • https://cdn.shopify.com/s/files/1/0431/1236/6229/files/45680412648.pdf
    • https://cdn.shopify.com/s/files/1/0429/2860/3295/files/wajomaremasar.pdf
    • https://cdn.shopify.com/s/files/1/0437/4567/3377/files/33541970923.pdf
    • https://cdn.shopify.com/s/files/1/0429/1185/8855/files/itsfoss_guide_install_linux_mint.pdf
    • https://cdn.shopify.com/s/files/1/0433/9430/2117/files/tukerajodidodomewepeka.pdf
    • https://cdn.shopify.com/s/files/1/0428/4927/1975/files/68738303527.pdf
    • https://cdn.shopify.com/s/files/1/0432/3262/4797/files/72671256389.pdf
    • https://cdn.shopify.com/s/files/1/0443/6888/7964/files/mba_assignment_cover_page_sample.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_off00004744.bin
4bdeb829c150dacac1bbbcb23599cc5a4ecf898d3247825f0637b60d05425c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4744 5484 bytes
font_01_sfnt_off000059c9.bin
72aced088bd0103840e449b6170912f4daf1a56e997e4bc953076f2bc54f56d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59C9 9412 bytes

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