Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9a9c97ae4a0c29…

MALICIOUS

PDF

92.7 KB Created: 2020-08-03 07:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0869d1fcd730612c7d11c657bc4c5ff9 SHA-1: 6e1fcd30b0a60f4f952f00c855e2c857e959a5c9 SHA-256: cf9a9c97ae4a0c29e16ac3207f671bcde45e80f82cd720a9a5398d18418da11a
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.cc'. Additionally, it exhibits a PDF link farm pattern, with numerous links pointing to Shopify-hosted PDF files. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to potentially harmful external content via these links.

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=seven+leaf+clover+gungeon
    • http://daxiva.pinaybeauteusabybeautederm.com/uploads/1/3/1/4/131482976/belelorubizageniv.pdf
    • http://files.whiterockjazz.ca/uploads/1/3/1/1/131163564/fukixamidujegidopi.pdf
    • http://files.twoteachersandawebsite.com/uploads/1/3/1/3/131398385/f873ef0d6e10f2.pdf
    • http://files.preisendorfer.net/uploads/1/3/0/8/130873840/663219.pdf
    • http://files.352coaching.com/uploads/1/3/1/3/131383544/julotide.pdf
    • https://cdn.shopify.com/s/files/1/0436/9081/9739/files/16687507109.pdf
    • https://cdn.shopify.com/s/files/1/0433/5783/1336/files/5954389133.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/94801378587.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1733/files/99388984165.pdf
    • https://cdn.shopify.com/s/files/1/0435/1744/4264/files/77413021108.pdf
    • https://cdn.shopify.com/s/files/1/0432/7938/4744/files/21974494276.pdf
    • https://cdn.shopify.com/s/files/1/0431/7573/9553/files/52443553824.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/fizzbuzz_python_recursion.pdf
    • https://cdn.shopify.com/s/files/1/0431/4886/9789/files/62510880560.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_off00012e4e.bin
9b7103d5cb03ace3cd8dd66d6b51bb043c1d49af7bc62a26885b89f8b95c6ffb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4E 5032 bytes
font_01_sfnt_off00013f8d.bin
ed22a513fc6f6b68829a99d20b2af5fbed45a7fccebc13ce6ffa5920b979730a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8D 11740 bytes