Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40f5c7dd5936352…

MALICIOUS

PDF

39.5 KB Created: 2020-08-28 07:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ac0e4cbf2586ab8b26f938866840dd4 SHA-1: bf106a00d40a3f6e7542c4fdf77fef3620fcc6c3 SHA-256: c40f5c7dd59363522c5e340738f80a44ade5398919cb0005622b95031ae84f3e
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body text, though partially corrupted, includes the phrase 'Mr mercedes free pdf', suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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 https://ttraff.ru/pify?keyword=mr+mercedes+free+pdf
    • http://files.katiemachain.com/uploads/1/3/1/4/131455283/57a787ca629.pdf
    • https://cdn.shopify.com/s/files/1/0436/9501/4056/files/siwamukuzeminozorerib.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9475/files/benexerapuritovon.pdf
    • https://cdn.shopify.com/s/files/1/0437/7391/9393/files/96481329158.pdf
    • https://cdn.shopify.com/s/files/1/0431/4667/4330/files/buwokujal.pdf
    • https://cdn.shopify.com/s/files/1/0429/4665/8463/files/67792578960.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1040/files/laxunivuxub.pdf
    • https://cdn.shopify.com/s/files/1/0428/9508/1625/files/xipasodejomamigoboduv.pdf
    • https://cdn.shopify.com/s/files/1/0437/5203/0357/files/ximodasiverojujofufufiv.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_off00005e23.bin
4663eb66baa50db756f5c7cb050ffda2a7d29e88bc257a5f85e9dd3f16f7222b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E23 5064 bytes
font_01_sfnt_off00006f4c.bin
707944412b0ebdf4e13c5871c83ef9ff3dbf8d0cfc3135c3241a6b6cd0ec2e1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F4C 10172 bytes

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