Malicious PDF — malware analysis report

Static analysis result for SHA-256 27269c414d94e8ae…

MALICIOUS

PDF

46.5 KB Created: 2020-08-09 17:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28e37a2df8f3c178e13c387331ca05bf SHA-1: 6b7f44451236bc6b55970b1e39c0ce789b94e66e SHA-256: 27269c414d94e8ae49c4badde40c2e715622823c06b76cf55901b7a58bd6ca74
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, also contains URLs. The primary malicious URL identified is https://ttraff.ru/pify?keyword=bench+vice+diagram+pdf, which is likely used for redirection. The presence of numerous links to external PDFs, as indicated by the PDF_SEO_LINK_FARM heuristic, suggests a tactic to manipulate search results or distribute further malicious 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.ru/pify?keyword=bench+vice+diagram+pdf
    • http://files.drazenillus.com/uploads/1/3/0/7/130776493/5c432059ae73.pdf
    • http://files.oursilentprincess.com/uploads/1/3/2/6/132681559/765fa519e1fa7.pdf
    • http://zezeforo.thepowerofpainting.com/uploads/1/3/0/8/130814238/xotiwajukex.pdf
    • https://cdn.shopify.com/s/files/1/0433/4642/8062/files/37552632639.pdf
    • https://cdn.shopify.com/s/files/1/0432/0490/3069/files/71806081713.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jivanup.pdf
    • https://cdn.shopify.com/s/files/1/0441/4645/8776/files/2020_camry_specs.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/9396032145.pdf
    • https://cdn.shopify.com/s/files/1/0448/4674/3709/files/ethernet_frame_size.pdf
    • https://cdn.shopify.com/s/files/1/0436/9501/4056/files/sazikilobo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4669/0203/files/zexosegebonuwidita.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46824776831.pdf
    • https://cdn.shopify.com/s/files/1/0447/6128/4757/files/working_principle_of_4_stroke_petrol_engine.pdf
    • https://cdn.shopify.com/s/files/1/0437/5996/0218/files/18060057972.pdf
    • https://cdn.shopify.com/s/files/1/0432/5287/5432/files/jogisamimi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2278/6466/files/wojujepobuvurinemam.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_off00006b03.bin
57df7da0091e8b901943e72f7493a74310383fd2916bfe4224b81737ac9532d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B03 5068 bytes
font_01_sfnt_off00007c0c.bin
a63f0f58edcc4e20c56adf82b5f38cb6be15647de67d5c8589631f25c1e6c802		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C0C 10328 bytes
font_02_sfnt_off00009f56.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F56 4324 bytes

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