Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a40e62ce831e147…

MALICIOUS

PDF

43.8 KB Created: 2020-08-23 23:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 098c94d07b2475126324899daba9a79f SHA-1: c9e9a7220e1e10da0a202ba296a2025c2fc928ab SHA-256: 9a40e62ce831e147801c798d5db64737f5bc3e591fc8de0b5329e16a6eadba6d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a redirector link to 'ttraff.cc', which is known malicious infrastructure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body is heavily obfuscated, but the primary attack pattern appears to be directing users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=lord+of+war+movie
    • http://files.nekimastrategies.com/uploads/1/3/0/7/130775001/musekogumod-xewuxarejaf-jupeku.pdf
    • https://cdn.shopify.com/s/files/1/0440/8924/5861/files/advanced_vocabulary_in_context_with_key.pdf
    • https://cdn.shopify.com/s/files/1/0431/5008/2202/files/57699448013.pdf
    • https://cdn.shopify.com/s/files/1/0432/6182/1092/files/a._n._m_course_information.pdf
    • https://cdn.shopify.com/s/files/1/0437/1090/6518/files/cascada_de_coagulacion_actualizada.pdf
    • https://cdn.shopify.com/s/files/1/0432/4599/4146/files/wetajigewugixob.pdf
    • https://cdn.shopify.com/s/files/1/0435/3005/9940/files/18454685144.pdf
    • https://cdn.shopify.com/s/files/1/0431/5152/4008/files/bakoxofolab.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pawatofamilafal.pdf
    • https://cdn.shopify.com/s/files/1/0431/5129/4628/files/los_misterios_del_santo_rosario_catolico.pdf
    • https://cdn.shopify.com/s/files/1/0461/9173/9043/files/gaxevudijafe.pdf
    • https://cdn.shopify.com/s/files/1/0429/8188/4067/files/trial_balance_sheet_meaning_in_gujarati.pdf
    • https://cdn.shopify.com/s/files/1/0437/6395/7909/files/ispad_diabetes_guidelines_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/4742/0066/files/sivupus.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_off00006e78.bin
b4cb6340386b68c82f98b703b5753021c29b08521e7f3d71d21b171844730b03
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E78 4936 bytes
font_01_sfnt_off00007f4c.bin
f76d0a6f90457abf024dce8c5d1d3d92e6b1a710339022be2e0ea418a14f534d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F4C 10404 bytes