Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9aa115abab15530…

MALICIOUS

PDF

36.3 KB Created: 2020-08-28 06:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc97cbfc0b0e7869ee905c46a881c350 SHA-1: 359639cf4579655532acd5799e003a18834dccf8 SHA-256: f9aa115abab15530c3bfc545c1fe9837d2f5dfbb7f108646c83de5f4736b2a31
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 redirector service (ttraff.ru) or are hosted on Shopify domains, suggesting a link farm or SEO poisoning tactic. The document body text is largely garbled but contains the phrase 'white conveyors parts', which is also present in the URL of the malicious redirector. The ML classifier strongly indicates maliciousness. The primary attack pattern involves directing users to potentially malicious external sites.

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/pify?keyword=white+conveyors+parts
    • http://files.dayspringfarm.org/uploads/1/3/0/8/130813846/rixovubofegezor.pdf
    • http://botevefev.cosmicsistershop.com/uploads/1/3/2/7/132712237/4c47ecdde78.pdf
    • http://files.piconazarene.com/uploads/1/3/0/7/130775918/f8123f.pdf
    • https://cdn.shopify.com/s/files/1/0431/1692/0996/files/vapizolozegep.pdf
    • https://cdn.shopify.com/s/files/1/0457/7165/3286/files/eu4_byzantium_guide_1._28._3.pdf
    • https://cdn.shopify.com/s/files/1/0434/4895/9142/files/sutera.pdf
    • https://cdn.shopify.com/s/files/1/0437/5127/6696/files/9213660899.pdf
    • https://cdn.shopify.com/s/files/1/0430/8910/0951/files/31531728490.pdf
    • https://cdn.shopify.com/s/files/1/0432/3059/3186/files/71567375679.pdf
    • https://cdn.shopify.com/s/files/1/0429/3849/9235/files/badiba.pdf
    • https://cdn.shopify.com/s/files/1/0447/1577/0012/files/agenda_2020_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/4321/6789/files/7977976519.pdf
    • https://cdn.shopify.com/s/files/1/0435/6951/2607/files/xojirejiritobepalojekox.pdf
    • https://cdn.shopify.com/s/files/1/0430/5027/0869/files/descendants_2_songs_musicpleer.pdf
    • https://cdn.shopify.com/s/files/1/0436/1682/9603/files/47959076440.pdf
    • https://cdn.shopify.com/s/files/1/0432/9567/0427/files/cancer_de_pulmon_que_es.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_off00004fd8.bin
a0e7c29b1d4c15340419137e2aa261786edac90ee82c8f78920d741a92dd3deb
pdf-font-stream PDF embedded font (sfnt) at offset 0x4FD8 5164 bytes
font_01_sfnt_off0000616c.bin
2d04d47222b4412aba05940e6dbdc98fd267693f06279e436c82c902805798b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x616C 10564 bytes