Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da6c31219110c94…

MALICIOUS

PDF

42.5 KB Created: 2020-05-08 20:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3662295cde65053ab621523c5d1b7d65 SHA-1: 8e407dcb9054a596b53341c4cbac9178670b20f3 SHA-256: 4da6c31219110c94d7943d9bcbdeb3daba1ea2083d18e8ee6edb1d2919eca40d
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDFs hosted on various domains, a technique often used for SEO manipulation or traffic redirection. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The embedded URLs and the structure suggest a campaign to drive traffic to a network of sites, likely for advertising revenue or to host further malicious content.

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://beingself-centered.com/uploads/1/3/0/4/130483963/130483963.html#free+first+aid+template
    • http://bakingandbaskets.com/uploads/1/3/1/6/131606298/1c9e4.pdf
    • http://westcliffesupplyco.com/uploads/1/3/0/6/130621257/vamavewizo_diruveke.pdf
    • http://akodesigns.com/uploads/1/3/0/3/130324390/sigive_numimoxogelemo_fixuzatibijazi_zolivowuxi.pdf
    • http://anothervideocompany.com/uploads/1/3/1/4/131406686/tofirizoxaked-vumogelolofezu-kemajoxoguxuli-futemo.pdf
    • http://bigwalkies.com/uploads/1/3/1/4/131453018/jufoxa.pdf
    • http://kornilenko.com/uploads/1/3/0/7/130776312/7b02c.pdf
    • http://pgsofficial.com/uploads/1/3/1/3/131384044/tirosa-ladexiw-gozudavagar-supomeru.pdf
    • http://cowboysmandj.com/uploads/1/3/1/6/131606839/543756.pdf
    • http://happyhealthyhypnotherapy.com/uploads/1/3/0/3/130313854/piriz_sapivaselidem.pdf
    • http://lens.fi/uploads/1/3/1/8/131872104/b6762a4fbf8.pdf
    • http://jackmcbride.net/uploads/1/3/0/4/130490476/kutigalarevagomosef.pdf
    • http://lincolnspremiermagazines.com/uploads/1/3/0/6/130604508/3173770.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off00006640.bin
56110401a82507d31ad663dcfe89783cc40cb19e89780867580e876f6e7f1b1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6640 10496 bytes
font_01_sfnt_off00008a50.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A50 16204 bytes

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