Malicious PDF — malware analysis report

Static analysis result for SHA-256 716925dc95b8e0f4…

MALICIOUS

PDF

76.0 KB Created: 2020-08-18 15:38:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6baa26560eb5be054f7736d4a21acb7b SHA-1: 75d72e7eb8de25418354af30b58c06cf5f2b2929 SHA-256: 716925dc95b8e0f48570963af60808514ceba97cc3d33b12d6cbf4aaa7d88475
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to disguise its malicious nature. The presence of a link farm and a critical heuristic firing for malicious redirector links strongly indicates a phishing or redirection attack.

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.com/pify?keyword=basic+statistical+tests+pdf
    • http://files.amandabeekhuizen.com/uploads/1/3/0/7/130775690/d5ff23774ec07bf.pdf
    • http://files.penncrestlions.com/uploads/1/3/1/4/131454106/7272726.pdf
    • http://files.atxgreenawards.org/uploads/1/3/1/0/131069899/1a7a19d86c08.pdf
    • http://files.dahliaspourhouse.com/uploads/1/3/2/3/132302859/sevipinusutimir-xinimaxiz-jifipat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1523/2923/files/63761938856.pdf
    • https://cdn.shopify.com/s/files/1/0437/6104/1559/files/ukulele_fingerpicking.pdf
    • https://cdn.shopify.com/s/files/1/0430/0200/3615/files/six_ideas_that_shaped_physics.pdf
    • https://cdn.shopify.com/s/files/1/0436/3727/6825/files/5797156726.pdf
    • https://cdn.shopify.com/s/files/1/0439/0024/0024/files/appsc_group_2_previous_papers.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13908697451.pdf
    • https://cdn.shopify.com/s/files/1/0433/1044/8798/files/lobubozosuturesizeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/1021/9432/files/38501881101.pdf
    • https://cdn.shopify.com/s/files/1/0430/6924/3553/files/86105184650.pdf
    • https://cdn.shopify.com/s/files/1/0430/6491/8165/files/pathogenesis_of_hepatitis_b_virus_infection.pdf
    • https://cdn.shopify.com/s/files/1/0430/9005/1221/files/buxuwudoxidoji.pdf
    • https://cdn.shopify.com/s/files/1/0432/5713/5257/files/nalofevo.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_off0000e1cf.bin
a24ff597ccf42a3cedc9d3e95d15537227beb8e345507d2bea10386f9e8009fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CF 5100 bytes
font_01_sfnt_off0000f331.bin
bcbd85b969d6e385caf0bce91d008269bb10ee1f05013507d39dfaf205475d25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 15308 bytes

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