Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c19f2fe058596b3…

MALICIOUS

PDF

40.4 KB Created: 2020-08-30 03:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 356c20cfda6d286fc306af78a72cb0cd SHA-1: 18b2db22822fe411ae2b864d0e8ff9df45ae49b9 SHA-256: 8c19f2fe058596b3c090d4af7c42ea064c80ff43557990ab0657af996e1f2fc7
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure for a study guide, and the embedded links, including one to 'ttraff.cc', likely serve to redirect the user to malicious content. The presence of numerous embedded links, many pointing to Shopify domains, suggests a link farm or SEO poisoning tactic to distribute the malicious payload.

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.cc/wix?keyword=their+eyes+were+watching+god+study+guide+answers+chapter+2
    • https://cdn.shopify.com/s/files/1/0430/3699/9842/files/pigasefesinisofifugavejoz.pdf
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/a_political_economy_of_africa_by_claude_ake_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/6544/1445/files/trek_hybrid_bike_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5807/files/58480215698.pdf
    • https://cdn.shopify.com/s/files/1/0428/4026/0775/files/akbar_birbal_ki_kahani_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/folititozijirosaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8359/files/45024762476.pdf
    • https://cdn.shopify.com/s/files/1/0434/0203/5351/files/rikitubawadirono.pdf
    • https://cdn.shopify.com/s/files/1/0431/1724/8672/files/kaisa_ye_marz_hai_ishq_ishq_mp3_song.pdf
    • https://cdn.shopify.com/s/files/1/0431/9051/7911/files/diablo_2_cta.pdf
    • https://cdn.shopify.com/s/files/1/0431/9736/6436/files/dudibosilalewivakimek.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/katitosanawufakevapo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4424/9499/files/astra_international_annual_report_2016.pdf
    • https://cdn.shopify.com/s/files/1/0436/0998/1085/files/48408276227.pdf
    • https://cdn.shopify.com/s/files/1/0433/6209/1167/files/terapia_anticoagulante_2017.pdf
    • https://cdn.shopify.com/s/files/1/0428/6955/5356/files/kinejiri.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_off00005ef1.bin
4e9bc480d8ad1ff28aceb665dcf88889ef2b3b40014b6868d95034b4e9261564		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF1 5576 bytes
font_01_sfnt_off000071f3.bin
b9b7f70b4603bb668ff44b8a51bfe3fa80b5d4473f6695f9e233446c2ad27c1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71F3 10144 bytes

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