Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42ae44012ea6f9f…

MALICIOUS

PDF

34.5 KB Created: 2020-04-10 16:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d352f26442b48d3842ff72af909835fd SHA-1: 9d2c0f8d91a3b44a35c1762184b7a9983082122d SHA-256: f42ae44012ea6f9f04f49d1e2df3c1d07c831f341b1b4c4c1b6e1465d6eddbef
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which appear to be part of a link farm designed to attract search engine traffic. The document body mentions a specific TV model, likely a lure to entice users to click on the malicious URLs. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ex-ite.net/uploads/1/3/1/4/131453188/131453188.html#westinghouse+tv+model+dwm50f3g1
    • http://provochildrensballet.com/uploads/1/3/0/6/130604554/dejesomef.pdf
    • http://lctklktihimaskiuntad.online/uploads/1/3/0/2/130287799/zaloduradunonitofopo.pdf
    • http://isitjennsbirthday.com/uploads/1/3/0/5/130539099/zitizijuzikiw.pdf
    • http://find-cable-deals.com/uploads/1/3/1/3/131379919/petefuzepof_fokev.pdf
    • http://aronweisgerber.com/uploads/1/3/1/6/131637113/pedarolixowuwa.pdf
    • http://liftupinstitute.com/uploads/1/3/0/5/130540097/3181539.pdf
    • http://gradnx.com/uploads/1/3/0/6/130604844/mapinu.pdf
    • http://amertoninvest.com/uploads/1/3/0/6/130605332/9083076.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005dc9.bin
e44039fa5412d71660f7270eda888bab3a4ad185e89a8ba92e5fff5fe5d3f974		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC9 8248 bytes

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