Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4e3f0732a8f4fd…

MALICIOUS

PDF

48.1 KB Created: 2020-08-08 08:40:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c2b6ee837556add599b1716eb039d85 SHA-1: 599cb79f25291eb78fcc044484d41c95904a3900 SHA-256: 3b4e3f0732a8f4fd5291d4b99e6ccbb71b913c549649e8a79578a0d4ea682bbb
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.ru'. The document body, though heavily obfuscated, contains this URL and appears to be a lure for a free PDF download. The presence of numerous other links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to increase visibility. 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=behavior+modification+principles+and+procedures+5th+edition+free+pdf
    • http://files.vertexprofessionalpainting.com/uploads/1/3/2/6/132696174/7361202.pdf
    • http://files.forumartspace.com/uploads/1/3/1/6/131637240/fatuj_vagerarisareded_rifut.pdf
    • http://files.eccai.ca/uploads/1/3/2/7/132740586/boxog-bokitebizaro-nirosenisaminow-ranemebaworefu.pdf
    • http://files.healthpoweredbyyou.com/uploads/1/3/0/7/130776067/butowub.pdf
    • https://cdn.shopify.com/s/files/1/0432/7833/6165/files/zafuwimixupa.pdf
    • https://cdn.shopify.com/s/files/1/0428/5680/8607/files/99760514010.pdf
    • https://cdn.shopify.com/s/files/1/0434/5652/8541/files/nodilenemapekitojusifupu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6341/files/dakofivitoxosufok.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/velokiw.pdf
    • https://cdn.shopify.com/s/files/1/0440/3609/6150/files/11729099870.pdf
    • https://cdn.shopify.com/s/files/1/0430/0842/6147/files/80262222335.pdf
    • https://cdn.shopify.com/s/files/1/0428/3275/6902/files/77809790425.pdf
    • https://cdn.shopify.com/s/files/1/0431/2861/9168/files/85269209187.pdf
    • https://cdn.shopify.com/s/files/1/0434/8706/8322/files/3426440333.pdf
    • https://cdn.shopify.com/s/files/1/0431/5817/5893/files/nuxixununegewupelixe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00008a05.bin
0f1cf8f55107d6d0bb9964e0b5b1031076d56aa33635209fec14c39d73ccccac
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8A05 23008 bytes
font_00_sfnt_off000055a0.bin
b567380d4b61a87af3cad8ea33ceea3d84db16525ff8d893e1540ed8b693fc63
pdf-font-stream PDF embedded font (sfnt) at offset 0x55A0 5628 bytes
font_01_sfnt_off000068a9.bin
110170928153cdd7e73855b6b93c0fcd6e8bf57975a1961ee648404240b3dcb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x68A9 9700 bytes