Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a31ca6443de705…

MALICIOUS

PDF

41.6 KB Created: 2020-08-17 02:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02be4e74ae242542f43b460ec97e4f9d SHA-1: a68a2b5323dc0ea8658fde7d28a8db9f75b72208 SHA-256: a4a31ca6443de7057c4986879d95a8a592c723a04c86e5bd2faab1acccddac92
150 Risk Score

Malware Insights

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

The PDF document contains a mass of external links, many of which point to what appears to be a link farm designed for SEO manipulation. One of these links, specifically `https://ttraff.com/pify?keyword=brain+teasers+adults+pdf`, is identified as a malicious redirector. The document body, though heavily corrupted, contains text related to 'brain teasers' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of numerous PDF links, many hosted on `cdn.shopify.com` and other domains, indicates a broad distribution strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.com/pify?keyword=brain+teasers+adults+pdf
    • http://files.brodyquixote.com/uploads/1/3/2/6/132695576/cd6533d.pdf
    • http://zamukiner.beingenlightenment.com/uploads/1/3/2/8/132814930/db5006147ec5444.pdf
    • http://files.nickhupton.com/uploads/1/3/0/7/130739470/7e0cfd4eb1.pdf
    • http://files.nancyfreemanstudio.com/uploads/1/3/2/3/132303264/lusejeburub.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0835/files/98997746053.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/93128762666.pdf
    • https://cdn.shopify.com/s/files/1/0437/6667/7655/files/musajojirir.pdf
    • https://cdn.shopify.com/s/files/1/0434/8451/2418/files/rezizinarakese.pdf
    • https://cdn.shopify.com/s/files/1/0429/9289/4115/files/93942637257.pdf
    • https://cdn.shopify.com/s/files/1/0432/0447/7090/files/68767771927.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/97295260199.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bararilisubolubudikolumo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3017/6159/files/99208331827.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_off0000654f.bin
9377ab88122387c442364f7e5f1f9f2b70bce41b55c9c2d4408fa9a333b91c52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x654F 5084 bytes
font_01_sfnt_off000076a2.bin
705db95852bcb4348132e5053233633d67c8eea6cd87d860c7783969189d08bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76A2 10328 bytes

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