Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe1b03d163e72394…

MALICIOUS

PDF

48.9 KB Created: 2020-08-07 12:40:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d191ec7a39f19b4eb77f3d31bb7c8e14 SHA-1: 6dbee340d39d3a0a842d91a494de9f292011f7c4 SHA-256: fe1b03d163e723942988236a8034114da3e269369e74b08dd035539ffc65d6ff
152 Risk Score

Malware Insights

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

The PDF document was identified as malicious due to its inclusion of a link farm pointing to known malicious redirector infrastructure. The primary malicious URL is https://ttraff.com/pify?keyword=question+tags+for+imperative+sentences+pdf. The document body, though heavily obfuscated, contains this URL and other links to Shopify-hosted PDFs, suggesting a lure or redirection mechanism. The ML classifier strongly supports the malicious verdict.

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=question+tags+for+imperative+sentences+pdf
    • http://files.backwoodsbeersoap.com/uploads/1/3/0/9/130969776/xogudopimibotulop.pdf
    • http://files.mrsfromm.com/uploads/1/3/0/7/130739996/rufeki-metulakedawifak.pdf
    • http://files.pianomomsheetmusic.com/uploads/1/3/2/6/132682124/830d6a98.pdf
    • https://cdn.shopify.com/s/files/1/0432/8439/8246/files/11025977867.pdf
    • https://cdn.shopify.com/s/files/1/0431/5077/0333/files/9173281351.pdf
    • https://cdn.shopify.com/s/files/1/0437/2611/0888/files/31251013580.pdf
    • https://cdn.shopify.com/s/files/1/0434/1530/6405/files/zovuxa.pdf
    • https://cdn.shopify.com/s/files/1/0432/9596/5352/files/50199161659.pdf
    • https://cdn.shopify.com/s/files/1/0437/8171/8167/files/zabuzuf.pdf
    • https://cdn.shopify.com/s/files/1/0439/7367/3118/files/5496835342.pdf
    • https://cdn.shopify.com/s/files/1/0431/3333/7768/files/fifati.pdf
    • https://cdn.shopify.com/s/files/1/0432/1571/6513/files/96537941768.pdf
    • https://cdn.shopify.com/s/files/1/0428/5222/1091/files/rusifadodap.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d2d.bin
911cbaa0ec9cd9c56ce575162e25b6386d87e2324b9f323cf65eb3d02e3b313b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D2D 5444 bytes
font_01_sfnt_off00006fa0.bin
6602516bd7b76ea8e82694fb0f9bc9a865b5b6524bdee7c4503ac764f7e78fd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA0 10568 bytes
font_02_sfnt_off00009314.bin
288de71edf57bf886cdf3d07283545883080ed1af789eec4c78edd97f1224bec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9314 16136 bytes
font_03_sfnt_off0000a7fe.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7FE 4324 bytes

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