Malicious PDF — malware analysis report

Static analysis result for SHA-256 65cf061c03729293…

MALICIOUS

PDF

40.8 KB Created: 2020-08-20 08:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb48a57ce06bba4181a314a85aa0b046 SHA-1: c59d25b2ad258f6460575f3370a2a64424d1c201 SHA-256: 65cf061c0372929303cd299cc6d497adb231e0be9417eba1cee757cbf5b7e11c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination and potentially track victims. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of numerous other PDF links, many pointing to Shopify, indicates a link farm strategy to improve SEO and potentially distribute malicious content. No scripts were extracted, but the ML classifier and redirector heuristic strongly indicate 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.com/pify?keyword=free+father+christmas+reply+letter+template
    • http://files.saintlawrencewr.org/uploads/1/3/0/7/130739570/zudire.pdf
    • http://files.dresdenavenue.com/uploads/1/3/0/7/130739654/ruzupo-detil.pdf
    • http://gepuzi.studentfinanceboard.com/uploads/1/3/1/4/131407945/kefenoliv-fuminel-lamawefapego-daxadatepafo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3771/0744/files/23355229864.pdf
    • https://cdn.shopify.com/s/files/1/0438/3624/4118/files/math_aids_advanced_order_of_operations_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/0515/7282/files/susipe.pdf
    • https://cdn.shopify.com/s/files/1/0429/9699/0105/files/3252751864.pdf
    • https://cdn.shopify.com/s/files/1/0435/7593/5135/files/tekalafirumumevu.pdf
    • https://cdn.shopify.com/s/files/1/0440/4648/3606/files/bixaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/9028/8541/files/cheran_pandiyan_padam_song.pdf
    • https://cdn.shopify.com/s/files/1/0437/7962/1026/files/xejepogumubuluvigesuvove.pdf
    • https://cdn.shopify.com/s/files/1/0429/6248/5407/files/certified_analytics_professional_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9670/files/zizutux.pdf
    • https://cdn.shopify.com/s/files/1/0430/6924/3549/files/tuxeti.pdf
    • https://cdn.shopify.com/s/files/1/0440/9065/4885/files/xarobero.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_off00006171.bin
52bc7ea9bc6dd35f1a00a14196b77d55db3daefbf3de3e691956925d88abd754		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6171 5312 bytes
font_01_sfnt_off0000736b.bin
3dc15aace4d4368b47552fc96ae831616b09846be622988152eaf73ab0b584f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x736B 10140 bytes

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