Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f63e88aa228b016…

MALICIOUS

PDF

34.8 KB Created: 2020-04-15 08:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3819a08b921df7843fef16cbb428e30b SHA-1: 5d390c309008d0456ad1367ae751aacb57924e43 SHA-256: 7f63e88aa228b016c3fd8c2e45d260f5bd43aef8196d9d312b1da3095d4b7a80
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to similarly structured URLs on various domains, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be a lure related to 'Chrome developer tools android device'. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://meshayla.com/uploads/1/3/1/4/131437680/131437680.html#chrome+developer+tools+android+device
    • http://howelltohealawound.com/uploads/1/3/1/0/131070158/vurusimogamuso.pdf
    • http://didyoufeedthedog.co/uploads/1/3/1/3/131383949/070ef1.pdf
    • http://bailaymeditaibiza.com/uploads/1/3/0/5/130543488/8963436.pdf
    • http://flowtextrading.com/uploads/1/3/0/8/130874591/fimatulobenot_ragezekumix.pdf
    • http://glcuppacake.com/uploads/1/3/0/6/130620345/2724534.pdf
    • http://fietsencoureur.com/uploads/1/3/0/3/130313746/xoxuzuw-bafuj-vuwepaw.pdf
    • http://brianaylordesigns.com/uploads/1/3/0/5/130538996/4813027.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_off0000608f.bin
b42fa2cb0a8f4ad2d981a6b15ed8c2cb814d234e67ee5661aca22d92dce4cfe4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x608F 7912 bytes

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