Malicious PDF — malware analysis report

Static analysis result for SHA-256 9404a1e6bde2e15e…

MALICIOUS

PDF

40.5 KB Created: 2020-08-16 13:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e88be59b8e0e671ab961928884adae80 SHA-1: 2b9f513ec550d7779e01d619e57d8d2a139c3f91 SHA-256: 9404a1e6bde2e15ead0969989f0078c9c05df5be83e4aa7556b3629f824bef8b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as a worksheet answer key. The document body and embedded links indicate a large number of external PDF links, many hosted on Shopify, likely to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious, supporting the observed redirection behavior.

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=molality+worksheet+13+answers
    • http://files.allgranitesarasota.com/uploads/1/3/2/6/132682076/7873559.pdf
    • http://files.shepherdsbiblestudychapel.com/uploads/1/3/2/8/132814071/b0265d57ab.pdf
    • https://cdn.shopify.com/s/files/1/0428/9173/9295/files/5487115651.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejukimuvili.pdf
    • https://cdn.shopify.com/s/files/1/0431/7465/8216/files/93163315706.pdf
    • https://cdn.shopify.com/s/files/1/0438/2323/5234/files/allahabad_high_court_ro_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0436/7558/2617/files/webole.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99237037604.pdf
    • https://cdn.shopify.com/s/files/1/0428/5267/9836/files/91689415582.pdf
    • https://cdn.shopify.com/s/files/1/0434/6255/7856/files/11864031273.pdf
    • https://cdn.shopify.com/s/files/1/0431/8769/9876/files/zekufatoxo.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_off00005e7f.bin
f6dc940345c4a1a91ba5c3dc08ce394570523b0e2ab02f97121639b9b81cf062		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E7F 5252 bytes
font_01_sfnt_off00007074.bin
37413ff0fefc8f4b9a82738111248a94c502c204fcfc839b836ed266650bff53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7074 11004 bytes

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