Malicious PDF — malware analysis report

Static analysis result for SHA-256 c54bc0aba1551f35…

MALICIOUS

PDF

39.1 KB Created: 2020-08-30 22:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0986ac84a53fb39e35cb568161a93afe SHA-1: 33e0e10ddf4ce6a75471dcee859e323b3fb8a828 SHA-256: c54bc0aba1551f35545e3aabb7cec19b4b2ec5ef99b0f2f1629cc6ced26962a2
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs. One critical heuristic identifies a link to known malicious redirector infrastructure at 'https://ttraff.cc/wix?keyword=animals+maroon+5+mp3+download'. The document body, though heavily obfuscated, also contains this URL and other links hosted on 'static.usrfiles.com'. This suggests the primary purpose is to lure users to potentially malicious sites.

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/wix?keyword=animals+maroon+5+mp3+download
    • https://static.usrfiles.com/ugd/9c0842_063f519fa6ec4f9bb66593d83a8118d5.pdf
    • https://static.usrfiles.com/ugd/70a38d_5739ea6a213b404b9e051781fc19a849.pdf
    • https://static.usrfiles.com/ugd/b8c837_4641cd3f38434792bf12e4f0fd3a7cff.pdf
    • https://static.usrfiles.com/ugd/b8c837_0de82c59e5914d0a97f4cb3f40464daf.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0e989ece0c043408877d2cb320f75f9.pdf
    • https://static.usrfiles.com/ugd/b8c837_7201f6fead11433995dd04fb9a5e2270.pdf
    • https://static.usrfiles.com/ugd/0aab01_29f0870942474dadad4aa058ff351cc9.pdf
    • https://static.usrfiles.com/ugd/9b5f63_fbaf159cf35f44eeb8f25ba6414727e8.pdf
    • https://static.usrfiles.com/ugd/82e28d_376182e030a64a24a2a22478b05fe98e.pdf
    • https://static.usrfiles.com/ugd/73c254_764314e081844b9393fb60c550fccaf6.pdf
    • https://static.usrfiles.com/ugd/269bb8_371cb53e101641508e647db9bdd6ce2d.pdf
    • https://static.usrfiles.com/ugd/5438e3_9b5b94b6a9c94a538b5dd82e11734559.pdf
    • https://static.usrfiles.com/ugd/b8c837_db3c08653dbf460793325522e1576ce8.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/xodali.pdf
    • https://cdn.shopify.com/s/files/1/0429/7277/4556/files/grade_10_biology_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0463/3214/9915/files/badger_meter_pc100_manual_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0433/0638/5573/files/puwigazinizesanetosofo.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_off00005a57.bin
36a07b9760c3326b88eb1e71a85060e699494961b68b8d4ce0ca8dad39ad9d18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A57 5476 bytes
font_01_sfnt_off00006ce4.bin
84355d88eafff68f6afbf34155823db22284ebc6827cb98eb1fd0a65e8f48baf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE4 10068 bytes

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