Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6379653208fbc0c…

MALICIOUS

PDF

42.1 KB Created: 2020-08-19 06:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1249c6cebd6e13d7e58d2b562072c7c4 SHA-1: 5e2f0457ab8d338b9195018aa01ecd98c6a35e28 SHA-256: b6379653208fbc0c3fc90b7939a3ad4e86f884fab1df236dd5b571905eb21cef
152 Risk Score

Malware Insights

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

The PDF contains embedded links that are part of a link farm, with one critical heuristic identifying a redirector link to ttraff.com. The document body, though heavily obfuscated, contains text related to 'Autumn leaves guitar sheet music free pdf' and the malicious URL, suggesting a lure to download or access malicious content. The ML classifier 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.com/pify?keyword=autumn+leaves+guitar+sheet+music+free+pdf
    • http://suzon.sydneyoland.com/uploads/1/3/1/4/131454269/97850.pdf
    • https://cdn.shopify.com/s/files/1/0427/9818/6663/files/windows_xp_bootable_iso_file_free.pdf
    • https://cdn.shopify.com/s/files/1/0440/2269/4046/files/bracket_music_audio.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/moxudenolaruxorurafugi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8104/files/kuxitujerit.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3270/files/60506921025.pdf
    • https://cdn.shopify.com/s/files/1/0440/3177/0789/files/40649841607.pdf
    • https://cdn.shopify.com/s/files/1/0438/8998/3640/files/kirby_vacuum_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/0157/6615/files/poresaparejubulenuwe.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_off00005590.bin
3ed5280ff88efb22af0d9a33a7481c7b7351b3188eff1127b9a2c30a82e89f18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5590 5620 bytes
font_01_sfnt_off0000687c.bin
4d43404cd83ebd75946b4f818d520d772cd26b5209ce0ee31b1bcffe2992b2c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x687C 15428 bytes

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