Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d1c55acafba41e…

MALICIOUS

PDF

46.2 KB Created: 2020-08-30 11:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e27bd12f2963db59771745e4edc37e58 SHA-1: da266baa3b12e8b8e1d1f1711a0733b2fb166500 SHA-256: c1d1c55acafba41ef0b889215f7b454123352fb94d0f526ad589085e1eef3daf
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=problem+solving+assessment+test+pdf'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The PDF also contains a large number of external links, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic to increase visibility. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious URL is sufficient for a high-confidence assessment.

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/wix?keyword=problem+solving+assessment+test+pdf
    • https://static.usrfiles.com/ugd/b91566_a66838f0013b415e83c4f164ba9bd329.pdf
    • https://static.usrfiles.com/ugd/b8c837_356df3f3bda94e95986ae01f14f53a80.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0d9ea0f57004c04b51958ec8cf844ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_492497955d6049b1af9958149695b4b1.pdf
    • https://cdn.shopify.com/s/files/1/0433/9420/3806/files/bootstrap_file_button.pdf
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/zotuvalilitefetesubefi.pdf
    • https://cdn.shopify.com/s/files/1/0436/0162/5252/files/pogen.pdf
    • https://cdn.shopify.com/s/files/1/0437/3679/3237/files/banjul_charter.pdf
    • https://cdn.shopify.com/s/files/1/0432/2515/3698/files/spanish_story_books_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0434/7992/4893/files/discovering_psychology_hockenbury.pdf
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/6413321228.pdf
    • https://cdn.shopify.com/s/files/1/0428/3406/7615/files/xapepesidelokewenedal.pdf
    • https://cdn.shopify.com/s/files/1/0436/5395/5742/files/pharmacology_made_ridiculously_simple.pdf
    • https://cdn.shopify.com/s/files/1/0463/0645/9810/files/57205326208.pdf
    • https://cdn.shopify.com/s/files/1/0431/0433/8073/files/91574431269.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30408896218.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068f0.bin
8064841f8c856085bc38ab9f9a7a974969b107f7e6265b80ee9573c15d95a5b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68F0 5348 bytes
font_01_sfnt_off00007aff.bin
969d778102e8a6f5124c8248e2086d6f994d21b7b4e9fb8310c9ce4b9725617c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFF 10176 bytes
font_02_sfnt_off00009dd4.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DD4 4324 bytes

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