Malicious PDF — malware analysis report

Static analysis result for SHA-256 b31bf23a993a4928…

MALICIOUS

PDF

44.4 KB Created: 2020-07-08 14:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: bdb55d62b75dda8ee5f4adfc97b48de8 SHA-1: fc07ced423399e100f5badf2770681133b2ee3d3 SHA-256: b31bf23a993a4928258fa4329870aa893419d4b02e1eeb3881a6d826cdd0e32c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a significant number of embedded links, many of which point to domains associated with link farms and redirectors. The primary link identified, 'https://ttraff.cc/wb?keyword=heap%20sort%20algorithm%20with%20example%20pdf', is a known malicious redirector. This suggests the document's purpose is to lure users into clicking these links, likely leading to further malicious content or exploits.

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.cc/wb?keyword=heap%20sort%20algorithm%20with%20example%20pdf In PDF document text
    • http://files.truewealthfg.com/uploads/1/3/2/7/132710687/migejowo.pdfIn PDF document text
    • http://files.lamaisondecreme.com/uploads/1/3/2/6/132696280/wadodofobomevowaj.pdfIn PDF document text
    • http://files.merarifernandez.com/uploads/1/3/1/4/131407165/6839308.pdfIn PDF document text
    • http://files.rusticrevivalco.com/uploads/1/3/1/3/131398591/dubaribomikoxugave.pdfIn PDF document text
    • http://files.jackienorman.com/uploads/1/3/1/8/131860787/xewaguxevaxo_xarak.pdfIn PDF document text
    • http://files.counsellingpsychologist.services/uploads/1/3/0/9/130969555/7582248.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://jiwunubi210957951.files.wordpress.com/2020/07/82960329577.pdfIn PDF document text
    • https://tudenobinedu359522656.files.wordpress.com/2020/06/48386750335.pdfIn PDF document text
    • https://ponusufos.files.wordpress.com/2020/06/runajelexupenagizofuzor.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000640c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x640C 5256 bytes
SHA-256: 6c3615e211ada83e2a9adefcdf15b6e6d0608c0cd8dc0553965f8d19ff395528
font_01_sfnt_off000075fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75FE 15072 bytes
SHA-256: 7c999ade44014f125f59729e3429dab18b2d092ee29cca15165e4f47d028582b

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