Malicious PDF — malware analysis report

Static analysis result for SHA-256 09e7f009f56489fa…

MALICIOUS

PDF

39.1 KB Created: 2020-08-17 14:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c26a87ce23d8f0182d78a6a000a8ab5d SHA-1: 0f2631ccb263f712189f748167069830d16871da SHA-256: 09e7f009f56489fac9096fa784635c23abf20e70bff59edee3e6d8a3d58cb2b2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to ttraff.ru. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a large number of external PDF links, suggesting a link farm for SEO manipulation or traffic redirection. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but also includes the malicious URL and several other PDF 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.ru/pify?keyword=smokey+eye+makeup+video
    • http://files.delawarefilliesfastpitch.org/uploads/1/3/1/3/131398507/3894519.pdf
    • http://files.aati-mass.org/uploads/1/3/1/3/131379761/fc343cd0784b0a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0835/0619/files/paleo_diet_plan_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0438/5934/5573/files/monstrosities_dnd_5e.pdf
    • https://cdn.shopify.com/s/files/1/0435/8216/1053/files/jidojogesasu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3505/7559/files/velulomogo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3716/2657/files/vinca_alkaloids.pdf
    • https://cdn.shopify.com/s/files/1/0427/9602/3975/files/anxiety_reducing_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0437/2935/4903/files/38656308301.pdf
    • https://cdn.shopify.com/s/files/1/0440/7833/4117/files/78277935708.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_off00005b5a.bin
442b8f05f3136b4975b10043a114bf644c5837898c5761beae03d53767b1f99c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B5A 5128 bytes
font_01_sfnt_off00006cc9.bin
da667853c4df4f89381c95a88ed558ecb5c919d27cf45df2caeb5d79f5a13f2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC9 10412 bytes