Malicious PDF — malware analysis report

Static analysis result for SHA-256 835b4214e1a4bc74…

MALICIOUS

PDF

41.0 KB Created: 2020-09-20 01:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b8152ce38228112806fa4fa65f6122e SHA-1: 18049cdd06be71b77f1db83e6ad6330c7e395874 SHA-256: 835b4214e1a4bc74bf3f16ec74060635f30f3f762d8bc0f21622afcb8b4120b7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics as malicious, specifically for containing a large number of external links pointing to potentially malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The embedded links likely serve as a lure to direct users to phishing sites or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.link/wix?keyword=the+analyst+john+katzenbach+pdf
    • http://vokeju.higracecentral.org/uploads/1/3/2/6/132681218/luwavinibibufakiruf.pdf
    • http://xezezod.namimidcentral.org/uploads/1/3/0/7/130740003/firizovav.pdf
    • http://sekusam.resultsvisualized.com/uploads/1/3/2/6/132680831/paxorukasape.pdf
    • http://files.gcmarshall2018.com/uploads/1/3/1/4/131453084/0c6f9f3d2b902a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://88453a48-417c-472a-aecf-6ebd1df9c5ca.filesusr.com/ugd/6203b9_a674b21fc30c43b5a5c3f45878d5ca5b.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0437/4609/9349/files/calculus_derivative_practice_problems.pdf
    • https://cdn.shopify.com/s/files/1/0436/1653/4690/files/ni_no_kuni_best_familiars_early_game.pdf
    • https://644aa413-ece2-4c59-9114-02ad47596208.filesusr.com/ugd/5f4192_7b07bf4af5a74794b1f63000a907e665.pdf?index=true
    • https://31fcffde-76fd-4bcf-930a-38fe36f85c62.filesusr.com/ugd/3d514e_efa81a97337c42aa88cb933abf2c6f71.pdf?index=true
    • https://073c74b9-4086-4ae7-8d3e-e3f98e393927.filesusr.com/ugd/6cf392_65515edfc1304f15a0027f3d97ff8fbd.pdf?index=true
    • https://467ce7b1-8c80-4d5f-a7e0-3d761e7fde0c.filesusr.com/ugd/1acd69_e7900e9b7bcf42109c3f332e49002df2.pdf?index=true
    • 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_off00006232.bin
67ed2ae93c36b844e7945486448b371e8f7f8bc1918a68e58ac14e379f08d190		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6232 5528 bytes
font_01_sfnt_off00007512.bin
493d686657a84e7eba61ad82972a1d1fdc55653762da9bbe5c0b744c9d3730e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7512 10060 bytes

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