Malicious PDF — malware analysis report

Static analysis result for SHA-256 85200efd35693e24…

MALICIOUS

PDF

55.6 KB Created: 2020-08-23 17:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9fa3fdf41636c616d15867bdc9a3dcf SHA-1: 30e25822986024355f8fef072810eb86ca729205 SHA-256: 85200efd35693e24bc54f3c108af450d6f6bb973205888972fcf339d4e88d427
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links, many pointing to a redirector service. The document body, though heavily obfuscated, contains a URL that matches one of the heuristic findings. The primary attack pattern appears to be a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=history+of+english+novel+summary+pdf
    • http://files.mikeflament.com/uploads/1/3/1/4/131482887/zokufimuzekajuxit.pdf
    • https://cdn.shopify.com/s/files/1/0439/0273/0408/files/itunes_win_10_64_bit.pdf
    • https://cdn.shopify.com/s/files/1/0435/3648/2458/files/category_theory_awodey.pdf
    • https://cdn.shopify.com/s/files/1/0431/0564/8801/files/12411072316.pdf
    • https://cdn.shopify.com/s/files/1/0429/0392/8991/files/boss_rc_3_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/83304487297.pdf
    • https://cdn.shopify.com/s/files/1/0428/4848/5535/files/85115484718.pdf
    • https://cdn.shopify.com/s/files/1/0429/1251/4201/files/kunexavesa.pdf
    • https://cdn.shopify.com/s/files/1/0432/9416/3109/files/bentley_repair_manual.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_off00009d4d.bin
ace9aa5c99b943d887f803bc194ab742e185631d08b191bb4b6ed5b740a8de5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D4D 5580 bytes
font_01_sfnt_off0000b01d.bin
c5f27b28edec92d182ceb70afd47e1da58213d9d8c4a6842df351349ce0542ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB01D 9976 bytes

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