Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aafb4d8b72eed2c…

MALICIOUS

PDF

44.9 KB Created: 2020-08-12 10:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7041c5dc7d5c874369bbbc48257768e SHA-1: 2e4b6e08c5888cc61131fe105099549ca39edde2 SHA-256: 8aafb4d8b72eed2c24f1cc67efc6bb53f6907f1909ab15407809b535837c4455
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. This link is presented within the document body, disguised as information related to manual treadmills. The document also contains a large number of external PDF links, many hosted on Shopify, which is indicative of a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious.

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/wb?keyword=manual%20treadmill%20curve
    • http://files.thelibraryofmyth.com/uploads/1/3/0/7/130739039/3776964.pdf
    • http://files.briketes.eu/uploads/1/3/1/0/131071315/3776944.pdf
    • http://vojisu.hayleyhudson.com/uploads/1/3/1/6/131637136/megasovo.pdf
    • http://ravef.annscrystalgarden.com/uploads/1/3/1/1/131163635/sokelefavatodobivire.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/33030524770.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/fosovawok.pdf
    • https://cdn.shopify.com/s/files/1/0432/5326/8642/files/jigalosetenakopa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5440/7578/files/10711411051.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/4117849179.pdf
    • https://cdn.shopify.com/s/files/1/0435/9674/2815/files/dnd_spell_sheet_5e.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1520/files/tawikosegi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/ravixagomiwiwimofo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7687/7478/files/devofujasav.pdf
    • https://cdn.shopify.com/s/files/1/0433/5622/5688/files/bodosowaroboz.pdf
    • https://cdn.shopify.com/s/files/1/0432/4311/0564/files/mekijinisuxofuk.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_off000072cd.bin
db46cd5d833d412d89d6f458879bd829f6462793ab6119f9c837d040ec228205		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72CD 4972 bytes
font_01_sfnt_off000083a0.bin
be648f8bb21e0a0b761052c0864833fa3b7fe689d8676551f3943a2114bc459e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83A0 10392 bytes

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