Malicious PDF — malware analysis report

Static analysis result for SHA-256 a326203bbec2f2d1…

MALICIOUS

PDF

44.6 KB Created: 2020-08-12 11:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad40f829d14e58b92a8a02e5c64370f3 SHA-1: cfb24be82fd7f86d2b7e27283e800cea514f30f1 SHA-256: a326203bbec2f2d1f1d39e246e3aaa686c8eb2ce163825c4ab8d043308c216bc
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=archaic+words+dictionary+pdf'. This indicates the document's primary purpose is to lure users to a malicious site. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to improve search engine visibility for malicious content. The ML classifier also 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.cc/pify?keyword=archaic+words+dictionary+pdf
    • http://files.suzannewandling.com/uploads/1/3/1/6/131606467/vabita-mezupexuwo.pdf
    • http://rorijiv.agefriendlybethel.org/uploads/1/3/1/3/131398351/8605098.pdf
    • http://files.pepperprep.com/uploads/1/3/2/3/132302916/ba289039c257540.pdf
    • http://files.penguinempirerobotics.org/uploads/1/3/0/8/130813314/29a76.pdf
    • https://cdn.shopify.com/s/files/1/0428/4248/8998/files/kinuratiwijamiki.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1042/files/fujilejapopeniwakok.pdf
    • https://cdn.shopify.com/s/files/1/0432/6372/1637/files/5880556978.pdf
    • https://cdn.shopify.com/s/files/1/0435/3146/8951/files/97604894090.pdf
    • https://cdn.shopify.com/s/files/1/0432/2036/9567/files/david_klein_organic_chemistry_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/4722/3458/files/denedawijamewuvuxeb.pdf
    • https://cdn.shopify.com/s/files/1/0438/0141/1744/files/saving_private_ryan_script.pdf
    • https://cdn.shopify.com/s/files/1/0433/2938/8699/files/seguridad_y_defensa_nacional.pdf
    • https://cdn.shopify.com/s/files/1/0438/1153/7053/files/camberwell_assessment_of_need_for_the_elderly.pdf
    • https://cdn.shopify.com/s/files/1/0434/8359/4917/files/fepivafozan.pdf
    • https://cdn.shopify.com/s/files/1/0447/9614/9921/files/cyanobacteria_characteristics.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
font_00_sfnt_off00006439.bin
c96e96a1def00954480b41e0420077ea775f58341b333fc74871ce32507382c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6439 5064 bytes
font_01_sfnt_off0000756f.bin
fa08e2db7b2c07317f6fac613975767f99cf1bd4864613d28d4dca3b10c89047
pdf-font-stream PDF embedded font (sfnt) at offset 0x756F 9964 bytes
font_02_sfnt_off00009784.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x9784 4324 bytes