Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b487c8ff24e7d9…

MALICIOUS

PDF

35.4 KB Created: 2020-08-06 14:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e81c99d840e710ccd8b7e1ccff2b2e2d SHA-1: 6395d675679cc611dbac9ec1df1bc09a2ea984a1 SHA-256: 58b487c8ff24e7d98d7a7adf017bd6a975c833857dab0fe46f86ed322de807d2
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=english+vocabulary+words+pdf+file'. The document body, though heavily obfuscated, also contains this URL and numerous other links to Shopify-hosted PDFs, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting the user to a malicious site under the guise of providing an English vocabulary PDF.

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=english+vocabulary+words+pdf+file
    • http://files.expectinginthegorge.com/uploads/1/3/1/0/131070521/60e72b08f84a.pdf
    • http://files.purejoyfarmsmn.com/uploads/1/3/1/8/131858592/forosawaz_xinawixuzewa.pdf
    • http://files.johankoegelenberg.com/uploads/1/3/0/7/130738806/bb38e57a20d.pdf
    • http://femimalo.musicalcolts.com/uploads/1/3/2/6/132681947/9090076.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lawup.pdf
    • https://cdn.shopify.com/s/files/1/0432/5815/1072/files/21192985114.pdf
    • https://cdn.shopify.com/s/files/1/0433/6159/9656/files/79354200247.pdf
    • https://cdn.shopify.com/s/files/1/0434/2136/8482/files/fundamentals_of_automation_technology.pdf
    • https://cdn.shopify.com/s/files/1/0430/0688/6051/files/48008878126.pdf
    • https://cdn.shopify.com/s/files/1/0438/9512/8216/files/xosur.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0679/files/83839540667.pdf
    • https://cdn.shopify.com/s/files/1/0433/5743/8101/files/annex_17_security.pdf
    • https://cdn.shopify.com/s/files/1/0434/2457/9736/files/vudadurojo.pdf
    • https://cdn.shopify.com/s/files/1/0434/8503/6706/files/java_two_dimentional_array.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4087/files/99396648248.pdf
    • https://cdn.shopify.com/s/files/1/0437/2958/4282/files/24959503558.pdf
    • https://cdn.shopify.com/s/files/1/0429/6533/6217/files/xewenine.pdf
    • https://cdn.shopify.com/s/files/1/0435/3500/7893/files/sillnu_oru_kadal.pdf
    • https://cdn.shopify.com/s/files/1/0428/3056/1436/files/liquid_rocket_engine_combustion_instability.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_off00004a18.bin
87ecf7dbc0454b95841074d05d9f248c2cebfe91337940f0b4b2b3279126e227		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A18 5768 bytes
font_01_sfnt_off00005dd3.bin
40e0dd351c256f345ffb1b0630d7c01d17830a8731d318edcd542246c9838d33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD3 10292 bytes

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