Malicious PDF — malware analysis report

Static analysis result for SHA-256 d666b5815b9a5703…

MALICIOUS

PDF

41.6 KB Created: 2020-08-30 16:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2735a189204b6ca383db9344845bdf73 SHA-1: 41b271cdf21370cf81c1deee53d0e98a75c17424 SHA-256: d666b5815b9a57036e687aae562b77b4ec79c9ae5d1d3eadbc0623149dea8949
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.club'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of numerous other links to Shopify PDFs indicates a potential link farm or SEO poisoning tactic to mask the malicious redirector.

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.club/wix?keyword=big+island+hawaii+surfing+lessons
    • https://cdn.shopify.com/s/files/1/0434/5046/6471/files/limpieza_de_sangre_libro.pdf
    • https://cdn.shopify.com/s/files/1/0432/2082/8315/files/m-_audio_bx8_d2_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/3741/5829/files/auxiliary_verbs_questions_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0434/6321/3209/files/normas_internacionales_de_auditoria_interna.pdf
    • https://cdn.shopify.com/s/files/1/0447/3788/8410/files/19748813546.pdf
    • https://cdn.shopify.com/s/files/1/0459/2848/0919/files/lowigogepag.pdf
    • https://cdn.shopify.com/s/files/1/0448/4608/8349/files/zack_wheeler_fangraphs.pdf
    • https://cdn.shopify.com/s/files/1/0434/2949/4940/files/61946822714.pdf
    • https://static.usrfiles.com/ugd/b8c837_96fd505f73ce4c528ffd0cc23ef824c5.pdf
    • https://static.usrfiles.com/ugd/b8c837_e89481e684a14465a2f29f9b678df186.pdf
    • https://static.usrfiles.com/ugd/b8c837_5534b1fd798b4bd2ab91d8ec39330eb0.pdf
    • https://static.usrfiles.com/ugd/48f461_9434add88844410899924d3384a83624.pdf
    • https://static.usrfiles.com/ugd/b7306e_0fb42ee0a2624ab4b8c9dde9f9333245.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_off0000648b.bin
6756a3a4fd0d23d4b2f8ddb7b2cfc2ae0bb8a8001f3b85f99ab7915d0f2def86
pdf-font-stream PDF embedded font (sfnt) at offset 0x648B 5308 bytes
font_01_sfnt_off000076a1.bin
28e61e13db25be98ebbd7111f1ab84984e2bb8af6a03edb7a1dc3b5be5e897f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x76A1 10148 bytes