Malicious PDF — malware analysis report

Static analysis result for SHA-256 0026a4a8aeb64b16…

MALICIOUS

PDF

34.0 KB Created: 2020-06-07 22:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aafb1d2e368ecee9d5f5f351395fafba SHA-1: dc9b1d6656b931907df84fd784579db330563614 SHA-256: 0026a4a8aeb64b167a34a6866457383707b36824124953502d4e82177a3922bc
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, identified as a link farm, directing users to potentially malicious sites. One prominent URL, https://ttraff.ru/wp3?keyword=sabiston+textbook+of+surgery+board+review+free+download#sabiston+textbook+of+surgery+board+review+free+download, is flagged as a malicious redirector. The document body, though obfuscated, contains text related to textbook downloads, suggesting a lure for users seeking free academic materials.

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.ru/wp3?keyword=sabiston+textbook+of+surgery+board+review+free+download#sabiston+textbook+of+surgery+board+review+free+download
    • http://plexus8.com/uploads/1/3/0/7/130740492/3faf461d555cf2a.pdf
    • http://jlpventures.com/uploads/1/3/0/5/130545493/3db8ec2ca74.pdf
    • http://webmail.temp046.madesimplydev.com/uploads/1/3/0/7/130739906/637626.pdf
    • http://hostmaster.sophietrimblephotography.com/uploads/1/3/1/8/131871419/wozumilitopuvafej.pdf
    • http://nikkimlee.com/uploads/1/3/0/6/130620731/01106e.pdf
    • http://annasports.com/uploads/1/3/1/1/131164202/a4ea6540934.pdf
    • http://johnsandola.com/uploads/1/3/0/2/130291694/jonazivurerifi_kemeseselibevi_nazoguki_fibazatuvur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://gikosunujuz.files.wordpress.com/2020/06/28044059371.pdf
    • https://nuvekutivuj.files.wordpress.com/2020/06/79539336930.pdf
    • https://zagufebaja.files.wordpress.com/2020/06/42851531994.pdf
    • https://jararevus.files.wordpress.com/2020/06/letonexuvojatulivid.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a63.bin
4872c09437bc00fd2c39d67c6774e71450ebcdf17c3775a388c580c388887769		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A63 9828 bytes

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