Malicious PDF — malware analysis report

Static analysis result for SHA-256 86bb738e703fdb1f…

MALICIOUS

PDF

39.8 KB Created: 2020-06-18 14:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b108cc34739d1d1d67c10e64293a2bc7 SHA-1: 307281cc1e2de0a547fa0c6b87e93e128cd2174f SHA-256: 86bb738e703fdb1f5ede6a8f8004a27b05c175cd12d04561435124c781dcba08
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

This PDF file exhibits characteristics of a link farm or traffic distribution scheme, as indicated by the PDF_SEO_LINK_FARM heuristic firing. It contains numerous external URIs pointing to various domains, all structured similarly with numeric slugs and file extensions. The primary purpose appears to be directing users to a network of hosted PDF documents, likely to serve as a distribution point for further malicious activity or to generate ad revenue. No scripts were extracted, and the document body is heavily obfuscated, making it difficult to determine the exact payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://encore00032.voyagerwebsites.com/uploads/1/3/2/6/132681937/132681937.html#nesco+pressure+cooker+manual
    • http://outfitcoach.de/uploads/1/3/1/6/131606819/xijomegetiji.pdf
    • http://meganhoppertcoaching.com/uploads/1/3/0/5/130588906/bamoxufujomoxip_xutidetudoxuk_dupetajud.pdf
    • http://poolcleanerslb.com/uploads/1/3/0/6/130603867/6777410.pdf
    • http://hempologyresources.net/uploads/1/3/1/3/131378970/wuwufuvijokeg.pdf
    • http://contentcoop.org/uploads/1/3/0/2/130289595/5271232.pdf
    • http://wanpukedouniuzenyangcainenying.br3h.com/uploads/1/3/0/6/130639285/wadujogafewibe.pdf
    • http://mail.crushthemarket.com/uploads/1/3/0/2/130289189/933c2575bdacd7f.pdf
    • http://byt5a.bpmtc.com/uploads/1/3/1/0/131070602/9573377.pdf
    • http://webdisk.0cycle.com/uploads/1/3/0/6/130639750/misupomeriz.pdf
    • http://maothaikitchen.com/uploads/1/3/1/0/131070498/9489985.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00005da9.bin
fd30c922592aa3d89ff00891f449d85b752b1f5c311d0ca4893fea0922662008		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA9 4864 bytes
font_01_sfnt_off00006e17.bin
4c35badc3f529b402c4e16e2afcb64cdc0721f51f4ef92abc69b7644a4c027c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E17 10908 bytes

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