Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e63cfeb77cd371d…

MALICIOUS

PDF

39.0 KB Created: 2020-08-19 20:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8efb2e657594e5d10fab640b73eaad20 SHA-1: 16bd288906c432c76fe45fda1a81c29d069838e7 SHA-256: 5e63cfeb77cd371de8200ef08a9e37c0de948cb0d7a332a6650795b0b35a2960
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.com/pify?keyword=coulomb%2527+s+law+problem+worksheet', is flagged as a malicious redirector. The document also exhibits characteristics of a link farm, with numerous external PDF links, suggesting an attempt to drive traffic to potentially malicious or SEO-abused content. The ML classifier strongly indicates maliciousness.

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=coulomb%2527+s+law+problem+worksheet
    • http://duzimav.27andoak.com/uploads/1/3/1/3/131378970/lujefupenulevixa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8520/9507/files/47647351403.pdf
    • https://cdn.shopify.com/s/files/1/0432/9917/6612/files/xalitad.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/kumiwareregozo.pdf
    • https://cdn.shopify.com/s/files/1/0437/2630/7480/files/brottsbalken_en_kommentar.pdf
    • https://cdn.shopify.com/s/files/1/0437/8597/8013/files/alibaba_ani_chalis_chor_story_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7707/4086/files/rogifug.pdf
    • https://cdn.shopify.com/s/files/1/0439/9644/6878/files/lasuzabarugaxiwaxovolu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1671/5429/files/wakesataniz.pdf
    • https://cdn.shopify.com/s/files/1/0431/8691/3431/files/tchaikovsky_nutcracker_piano.pdf
    • https://cdn.shopify.com/s/files/1/0440/4350/1733/files/earthquake_and_fire_drill_narrative_report.pdf
    • https://cdn.shopify.com/s/files/1/0461/9540/9054/files/magazine_template_photoshop_free.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_off00005c90.bin
953146b7cb4b3e5f68fd66cb5bb27b555b678b2448cd32601f8812ec487b50ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C90 5296 bytes
font_01_sfnt_off00006e82.bin
adbe70a3bb97a09651383d7cf154a55c74eb05de0f9ccdd1ffc09f501c84951f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E82 9552 bytes