Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba759c84bea21ab8…

MALICIOUS

PDF

49.2 KB Created: 2020-09-06 06:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d07d8921e9f724ce58487bdb61b9f963 SHA-1: 48e403ad9a864af362cc9ddc5b7d0199980bffcb SHA-256: ba759c84bea21ab843a76bfabcb0c34a419ea4d6d387a29a8d1906be6c23c21b
152 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, but one critical link redirects to a known malicious domain. This suggests a link farm or SEO poisoning tactic to lure users to a malicious redirector. The ML classifier strongly supports the malicious nature of this PDF.

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=chacha+chaudhary+books+pdf
    • https://cdn.shopify.com/s/files/1/0432/9373/7110/files/kosamiwa.pdf
    • https://cdn.shopify.com/s/files/1/0437/4927/7845/files/accidental_inventions.pdf
    • https://cdn.shopify.com/s/files/1/0432/1086/6851/files/orchestration_books.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/91133320514.pdf
    • https://cdn.shopify.com/s/files/1/0432/8135/0820/files/audit_risk_assessment_procedures.pdf
    • https://static.usrfiles.com/ugd/fe83c3_98ee3d7d852e4d399b640229759e816a.pdf
    • https://static.usrfiles.com/ugd/64db51_055249acf4a34e1596aea89be921a3cc.pdf
    • https://static.usrfiles.com/ugd/0994f9_d87f7b33cf6e4ee7b7a46c98d4ae5bd3.pdf
    • https://static.usrfiles.com/ugd/ef253e_4bccb642d97446d8b5b2780822bf8501.pdf
    • https://cdn.shopify.com/s/files/1/0437/7011/8302/files/vofawutaxutapidisituva.pdf
    • https://cdn.shopify.com/s/files/1/0434/0708/1622/files/romeo_and_juliet_1996_full_movie.pdf
    • https://cdn.shopify.com/s/files/1/0456/8252/4319/files/renton_reporter_calendar.pdf
    • https://cdn.shopify.com/s/files/1/0437/7057/7045/files/17148375741.pdf
    • https://cdn.shopify.com/s/files/1/0435/7039/7352/files/jokugokiwoviwab.pdf
    • https://static.usrfiles.com/ugd/b8c837_8fba20c10aed4626bec197012fb0036f.pdf
    • https://static.usrfiles.com/ugd/0ebc1f_fb873f44ae984beb9f5d4d3f9ddf5fc3.pdf
    • https://static.usrfiles.com/ugd/4479ed_90f52c3854714b0eb49ecdf81b269e19.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007678.bin
b37766eef4275aef1fdce715e56310300bc8807752569268391a9bc6af912d1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7678 5072 bytes
font_01_sfnt_off000087ba.bin
671f4a16fc68696b9acc8f3ddd648bf0b6e977985f7c930591824c6540340b02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87BA 9956 bytes
font_02_sfnt_off0000a9d7.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9D7 4324 bytes

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