Malicious PDF — malware analysis report

Static analysis result for SHA-256 868c7096530acaed…

MALICIOUS

PDF

36.8 KB Created: 2020-08-22 02:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15183ae48c43c38fccaa9b92cad84cd6 SHA-1: b566dcff00d599cd82a74735171a5915c17bb906 SHA-256: 868c7096530acaed5f71c27f1e966dcb96f238a865f555b7671b71246eae730a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to external PDF files, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://ttraff.ru/pify?keyword=isotopes+and+ions+practice+worksheet', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other Shopify links, reinforcing the lure. The ML classifier strongly indicates maliciousness.

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.ru/pify?keyword=isotopes+and+ions+practice+worksheet
    • http://bakode.crystalstreetchiro.com/uploads/1/3/1/6/131637021/83c60239.pdf
    • http://sibar.normacowie.com/uploads/1/3/1/6/131636648/dufizurena.pdf
    • http://files.toledohvacpros.net/uploads/1/3/0/8/130813645/fc32d9814a98e.pdf
    • http://files.boomerangsandrings.com/uploads/1/3/0/8/130873992/1343786.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3095/3627/files/64963052684.pdf
    • https://cdn.shopify.com/s/files/1/0432/3108/4708/files/89083118822.pdf
    • https://cdn.shopify.com/s/files/1/0429/4452/8550/files/like_a_prayer_choir_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0436/3993/1033/files/wegur.pdf
    • https://cdn.shopify.com/s/files/1/0428/7194/7430/files/30034209319.pdf
    • https://cdn.shopify.com/s/files/1/0431/6689/2191/files/95506775738.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3270/files/minobunafegufaj.pdf
    • https://cdn.shopify.com/s/files/1/0435/5260/4328/files/wativevifevutejude.pdf
    • https://cdn.shopify.com/s/files/1/0428/8797/0975/files/15648255080.pdf
    • https://cdn.shopify.com/s/files/1/0432/7391/2488/files/75555842489.pdf
    • https://cdn.shopify.com/s/files/1/0433/9128/7461/files/bopururu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3285/files/arcsoft_photoimpression_4_gratis.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005128.bin
091492347e1c6cc75728c505f944092149622ca764518a4027c8d43427090a7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5128 5220 bytes
font_01_sfnt_off000062f1.bin
67818f5223e0cb7c98f044e5cf0d3c377016521b992aabb1ee367cd65b8880b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F1 10348 bytes

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