Malicious PDF — malware analysis report

Static analysis result for SHA-256 57bc74dab40b12da…

MALICIOUS

PDF

62.8 KB Created: 2020-08-30 02:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5201766f857c2c7fe6a73b524803149 SHA-1: cc302fd9cfbd18dc66636c2c8c58c595183b28c5 SHA-256: 57bc74dab40b12da118a31b01318443e6438def5fbbc93dd8b37b97d66ade2bf
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed for SEO manipulation. One critical heuristic firing indicates a direct link to known malicious redirector infrastructure at 'https://ttraff.ru/wix?keyword=anestesicos+generales+vademecum'. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but also includes the malicious URL and several benign-looking URLs, suggesting a lure to a malicious site.

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/wix?keyword=anestesicos+generales+vademecum
    • https://static.usrfiles.com/ugd/b8c837_d338ca3a582f474e87f46e58dc40be08.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6560a86dbcf4117848d2f1d9867529d.pdf
    • https://static.usrfiles.com/ugd/b8c837_258c5ebfe2f44e61ae08dfc4b160009d.pdf
    • https://static.usrfiles.com/ugd/e1d12c_86906bd97c904e93afe3b0dd05512a5d.pdf
    • https://static.usrfiles.com/ugd/ce77c6_3b2af02a12ca448aa3a4c3f5dc63c245.pdf
    • https://cdn.shopify.com/s/files/1/0431/0099/5741/files/82305066742.pdf
    • https://cdn.shopify.com/s/files/1/0430/2051/7537/files/wonusupowifeguwozugewo.pdf
    • https://cdn.shopify.com/s/files/1/0435/8458/5883/files/lifejazedunubapikazinomuf.pdf
    • https://static.usrfiles.com/ugd/0a052f_86355c1a6945466aa573f0bf3c7d769d.pdf
    • https://static.usrfiles.com/ugd/299074_8ae61d27900a428682555034cf4999d4.pdf
    • https://cdn.shopify.com/s/files/1/0470/6477/6872/files/kitolasebepoxefowituda.pdf
    • https://cdn.shopify.com/s/files/1/0438/8877/1227/files/performance_appraisal_systematic_review.pdf
    • https://cdn.shopify.com/s/files/1/0432/0677/0849/files/40249421520.pdf
    • https://cdn.shopify.com/s/files/1/0430/2569/4883/files/21_day_bone_broth_diet_meal_plan.pdf
    • https://cdn.shopify.com/s/files/1/0434/5308/7911/files/jobaviduwegowiper.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008dde.bin
51489f2a4437836a713eaa66b87e8d9c599585c754f4ed9e951c9fe6998afbf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DDE 5308 bytes
font_01_sfnt_off00009fc2.bin
838c88468f7856a7e1cc96a340296ebe6512ea3d5a9e1e1810da3cb64d183958		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FC2 6496 bytes
font_02_sfnt_off0000b100.bin
14acdb92998c71703e725588b826109450c0bbd4c9e9c025e0861d34e50525cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB100 11552 bytes
font_03_sfnt_off0000d6c5.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C5 16204 bytes

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