Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f48def76f534a72…

MALICIOUS

PDF

44.2 KB Created: 2020-08-04 09:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6222f86eb7f0c11c8d4afc857e97b4b SHA-1: fdb64a4ed09c63aac28851cc5257a1c244a65697 SHA-256: 8f48def76f534a7249ecf40f776dfe1cce52da525c8b69a26bb8db9dbc3cd9fb
152 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.cc, which is disguised with a keyword related to learning Japanese. The document body also contains numerous links to Shopify-hosted PDFs, suggesting a link farm or SEO poisoning tactic to increase visibility. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves redirecting the user to malicious infrastructure.

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/pify?keyword=apprendre+le+japonais+d%25C3%25A9butant+pdf
    • http://files.hayeon.studio/uploads/1/3/2/7/132712325/a1f8c3.pdf
    • http://files.adamandserena.com/uploads/1/3/2/8/132814050/5700574.pdf
    • http://files.palmamingozzi.com/uploads/1/3/2/6/132695457/tesiredumug-jenetof-pofopikutebuw-wafuvebotira.pdf
    • https://cdn.shopify.com/s/files/1/0436/4235/5865/files/vomobijosasizibeterojisub.pdf
    • https://cdn.shopify.com/s/files/1/0429/5232/7324/files/95370863354.pdf
    • https://cdn.shopify.com/s/files/1/0430/1750/2869/files/62720550275.pdf
    • https://cdn.shopify.com/s/files/1/0431/2183/6193/files/64709068034.pdf
    • https://cdn.shopify.com/s/files/1/0428/6241/1935/files/54966096502.pdf
    • https://cdn.shopify.com/s/files/1/0432/0401/8336/files/fodukeraresobufot.pdf
    • https://cdn.shopify.com/s/files/1/0440/9825/7048/files/69670724949.pdf
    • https://cdn.shopify.com/s/files/1/0432/8754/3964/files/xiwiwiwasexobivojuwebi.pdf
    • https://cdn.shopify.com/s/files/1/0437/0009/3083/files/xevemoxinipux.pdf
    • https://cdn.shopify.com/s/files/1/0431/1656/0550/files/34746303340.pdf
    • https://cdn.shopify.com/s/files/1/0429/3600/8870/files/78065618396.pdf
    • https://cdn.shopify.com/s/files/1/0436/0064/2211/files/battlestar_galactica_episodes_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/9409/8598/files/8626442596.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_off00006ad7.bin
ae46757c729178b15759a1ca9b8ecec9e59334e8f076ac973dc3b136ece94c63
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD7 5384 bytes
font_01_sfnt_off00007ce8.bin
48955b817fb8e366747401551d845c238b8da121a36f3c0c6bf5eb6a70223a09
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE8 11916 bytes