Malicious PDF — malware analysis report

Static analysis result for SHA-256 e647bab027e2cf44…

MALICIOUS

PDF

33.9 KB Created: 2020-08-17 13:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a29d356a29e032fc634147e88c5691d4 SHA-1: a21f7660514f55b9b2b6231a0340aa4aaa0dc961 SHA-256: e647bab027e2cf44ecb01f361da9871fc2f19bd8eb746c85bbad043cabb24744
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=concentric+ab+annual+report'. The document body, though partially corrupted, contains text related to an 'annual report' and the malicious URL, reinforcing the lure. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=concentric+ab+annual+report
    • http://xojid.pacificmfg.com/uploads/1/3/0/7/130775195/xelilevofobuf_dupodanaxazo.pdf
    • https://cdn.shopify.com/s/files/1/0436/0660/5987/files/kiwewev.pdf
    • https://cdn.shopify.com/s/files/1/0432/5238/3902/files/fulokunu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3511/5176/files/tetovuxufupifogeja.pdf
    • https://cdn.shopify.com/s/files/1/0439/3641/5899/files/94531850526.pdf
    • https://cdn.shopify.com/s/files/1/0428/5369/5647/files/68227060084.pdf
    • https://cdn.shopify.com/s/files/1/0432/3144/5156/files/27494653396.pdf
    • https://cdn.shopify.com/s/files/1/0429/1647/9132/files/35667672197.pdf
    • https://cdn.shopify.com/s/files/1/0451/1108/3160/files/shinobi_origin_trello.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/vusuginometotixotab.pdf
    • https://cdn.shopify.com/s/files/1/0430/6331/2533/files/40733181792.pdf
    • https://cdn.shopify.com/s/files/1/0432/2538/3073/files/71488625830.pdf
    • https://cdn.shopify.com/s/files/1/0433/5848/6678/files/70643583191.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_off00004805.bin
ec4ebb5251c6b3774cce2b9c793fd2e37a1b426cc188571fde35d667ad47b363		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4805 4792 bytes
font_01_sfnt_off00005850.bin
d963fe3f1032f017bf15f8ec028db0af872207a945864e74d91fefd46d63cec4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5850 10264 bytes

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