Malicious PDF — malware analysis report

Static analysis result for SHA-256 81eff31b9eae181f…

MALICIOUS

PDF

41.0 KB Created: 2020-08-12 20:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38877f1bfb4bdab96b7744f4cd375909 SHA-1: 14b6456dd5befa28a6a783f5f63854a8927de5a8 SHA-256: 81eff31b9eae181f618e78fe7d04b26dfb1b2d02fc6d10801b50bd05c228c3ca
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lead users to malicious content. The document body also contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic to obscure the malicious redirector. 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://ttraff.com/pify?keyword=i+am+aldolpho+sheet+music+pdf+free
    • http://ruvireri.wandapayne.com/uploads/1/3/2/6/132680813/a67ac78.pdf
    • http://rafolofan.amandamargot.com/uploads/1/3/2/6/132682883/zofixugurik_zenin_soxazato_zoxojixidewim.pdf
    • http://files.resonancega.com/uploads/1/3/1/0/131070733/nebav.pdf
    • https://cdn.shopify.com/s/files/1/0435/8596/2142/files/bsc_1st_year_books_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/9830/0823/files/wumaparelamerikedunirosaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/0156/0737/files/agendas_alternatives_and_public_policies_kingdon.pdf
    • https://cdn.shopify.com/s/files/1/0431/0846/6845/files/zopixoritanupumesexejozu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4738/6264/files/moninopa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6302/5559/files/whirlpool_duet_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0439/0181/2888/files/fluid_mechanics_cengel.pdf
    • https://cdn.shopify.com/s/files/1/0431/3009/3728/files/denitanaxa.pdf
    • https://cdn.shopify.com/s/files/1/0450/2038/1342/files/al_quran_only_bangla_translation.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/25933281892.pdf
    • https://cdn.shopify.com/s/files/1/0433/3918/6344/files/65892049784.pdf
    • https://cdn.shopify.com/s/files/1/0435/2920/7957/files/celestial_navigation_tom_cunliffe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nepel.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005392.bin
66339dbffa3c0022635b1a860198db0843e07fa895ef57bc5ef3d1a00c639520		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5392 5108 bytes
font_01_sfnt_off000064ef.bin
fb71c72adaa4986e6c6f49ed985d7192569e54cfad567bbb416e2808c96f0ade		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64EF 10592 bytes
font_02_sfnt_off0000891f.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x891F 4324 bytes

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