Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3fe686855d3c184…

MALICIOUS

PDF

42.5 KB Created: 2020-08-24 02:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df32abfd257b95205f3d66b0ed3cf3bd SHA-1: e396179b6dde11d22ec608c3eedb049bd0e09f45 SHA-256: a3fe686855d3c184e233caf8d336f1f950fa2d1bec2cc60eac1d86eb464cdd47
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with a critical heuristic firing indicating a PDF link farm. One of the primary URLs, 'https://ttraff.ru/pify?keyword=batman+begins+gamecube', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other Shopify-hosted PDF links, suggesting a coordinated effort to distribute malicious content or manipulate search engine rankings. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=batman+begins+gamecube
    • http://files.dreamallianceservices.com/uploads/1/3/2/6/132683088/junemu_novagumazowejot_nelefaveverixo_guxisutoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/9145/1294/files/gekutalivorosupikumi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5129/4628/files/bjt_amplifier.pdf
    • https://cdn.shopify.com/s/files/1/0437/6546/5245/files/compliance_auditor_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0437/7441/0909/files/post_office_building_plan_drawing.pdf
    • https://cdn.shopify.com/s/files/1/0436/6126/3001/files/interactive_cadaveric_dissection_guide.pdf
    • https://cdn.shopify.com/s/files/1/0427/5198/3772/files/49091241251.pdf
    • https://cdn.shopify.com/s/files/1/0439/6577/6030/files/96040000236.pdf
    • https://cdn.shopify.com/s/files/1/0428/3020/0991/files/bacterial_blight_of_rice.pdf
    • https://cdn.shopify.com/s/files/1/0431/8121/1802/files/1142874674.pdf
    • https://cdn.shopify.com/s/files/1/0428/7404/4579/files/fukusisunarome.pdf
    • https://cdn.shopify.com/s/files/1/0437/2607/8101/files/44355100901.pdf
    • https://cdn.shopify.com/s/files/1/0430/6875/2023/files/persona_5_kaneshiro_boss_fight_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/3525/5203/files/4146814791.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_off000068bb.bin
3157ee057b902b88c6dbd921fd1099c6b05c482368a546992df9c3a67f8b90a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x68BB 5180 bytes
font_01_sfnt_off00007a46.bin
d558cefe540fc0aca22196c85b4d60894a5118c1a34c4a02ae7f2410cc4703a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A46 10292 bytes