Malicious PDF — malware analysis report

Static analysis result for SHA-256 3764e78f0b37d266…

MALICIOUS

PDF

41.8 KB Created: 2020-04-09 21:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d0857c87819d55f678b0cb4bb0fa5743 SHA-1: 8ec643faba718a6aeff39b1d48214d695904584e SHA-256: 3764e78f0b37d266bc4e056fd16ccf605ae870f4f4b26886c3276026b7bb9481
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are structured as SEO-optimized PDF lures, suggesting a link farm or content distribution network. The document body, though partially corrupted, contains a URL that appears to be a lure for a "free movie download", indicating a social engineering tactic to drive traffic to malicious or ad-filled sites. The ML classifier strongly flagged this PDF as malicious.

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://hbcphx.org/uploads/1/3/0/9/130969624/130969624.html#dr+seuss+the+cat+in+the+hat+movie+free+download
    • http://barbcowanart.com/uploads/1/3/0/6/130604255/3ae3d3265a4.pdf
    • http://mobytrack.com/uploads/1/3/0/3/130379380/7629931.pdf
    • http://clintweiler.com/uploads/1/3/0/5/130589342/6441138.pdf
    • http://sasmitaworld.org/uploads/1/3/0/6/130604011/6fa2c5ad66c288.pdf
    • http://loverocksnashville.org/uploads/1/3/0/5/130588545/51b930c2953.pdf
    • http://heartfelthaven.org/uploads/1/3/0/5/130550879/920ab93.pdf
    • http://kairoshomeimprovement.org/uploads/1/3/0/7/130776726/22854.pdf
    • http://angelhomebiz.info/uploads/1/3/0/2/130287538/5925100.pdf
    • http://dvallenilla352.com/uploads/1/3/0/5/130551247/b2afc4ef0615.pdf
    • http://bobbywayneclark.com/uploads/1/3/1/0/131069934/8114040.pdf
    • http://felixjanssencatering.com/uploads/1/3/0/6/130604979/wikilewolawo-mekuzabu.pdf
    • http://powerofproton3.website/uploads/1/3/1/3/131379554/30b4ea367c98e.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_off00007070.bin
aff6abe2eed409213207c74b0b733a96285aa504c3f6890bceeec08a62febfef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7070 8088 bytes
font_01_sfnt_off00008ff8.bin
0a74f62927e6506cf556ce04093ddaf717254a888a2313c4e0126ed6d6ed1ae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF8 2484 bytes

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