Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb4fc6917602dc3…

MALICIOUS

PDF

38.8 KB Created: 2020-05-31 14:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5bae6b7aa7ee1957fc29460047a7847 SHA-1: e8821125bfd2fb8b715ffe88e0e4be749542eb6d SHA-256: 4bb4fc6917602dc3ddba92da7322ddad18cfbf1aea9c55d6a30e8ec42a6880af
96 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest a link farm or SEO manipulation tactic, potentially leading to malicious content or phishing pages. No scripts were extracted, limiting the analysis of direct payload delivery mechanisms.

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://tommydoggy.com/uploads/1/3/0/5/130544384/130544384.html#brave+lance+fire+emblem+heroes
    • http://slimnotfat.com/uploads/1/3/0/9/130969429/5729074.pdf
    • http://3ga.undesirable.us/uploads/1/3/0/7/130739968/pufuwi-mafexijimomino-zizezabaza.pdf
    • http://hostmaster.markwhittam.com/uploads/1/3/1/0/131071278/38870e792fb.pdf
    • http://shortrider.com/uploads/1/3/0/4/130477541/c0b2fe905.pdf
    • http://moradrywall.com/uploads/1/3/0/7/130739839/tedukububit.pdf
    • http://sparksunitecom.com/uploads/1/3/0/6/130621847/rubidukupijub.pdf
    • https://nidiximas.files.wordpress.com/2020/05/jogeramomilipatitosaz.pdf
    • https://ziwuxujit.files.wordpress.com/2020/05/gewitoze.pdf
    • https://fixizexum.files.wordpress.com/2020/05/xokadapupawoz.pdf
    • https://fupalowonega.files.wordpress.com/2020/05/malasedag.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_off00005f79.bin
196b9d219cc7cd0d9f6b494f0a5383dc5afa27f11e15c90b6cad6f9164d69662		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F79 3544 bytes
font_01_sfnt_off00006c14.bin
57cef3bed86b517abebd96e8ef4e3ae5619a14200720d3dd4947c286729882b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C14 10588 bytes

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