Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b41ea88984f582…

MALICIOUS

PDF

36.9 KB Created: 2020-08-29 21:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d8048cb9fccbb5afa806551f3d5fccc SHA-1: 8e3f5a44cfffe463de4c538d378927be6ba1880e SHA-256: 94b41ea88984f58241890c110053c2cb58a58d2506fa9f9dbef3b97e7391ffd4
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.com/wix?keyword=functions+statistics+and+trigonometry', is identified as a malicious redirector. The document also exhibits characteristics of a link farm, with numerous links pointing to Shopify-hosted PDFs. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. The primary attack vector appears to be social engineering through deceptive links within the document.

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/wix?keyword=functions+statistics+and+trigonometry
    • https://cdn.shopify.com/s/files/1/0428/2990/6079/files/lawobixirolowurixalipoxas.pdf
    • https://cdn.shopify.com/s/files/1/0441/1945/7944/files/austin_chronicle_voting_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/0557/4311/files/risk_game_of_thrones_skirmish_rules.pdf
    • https://cdn.shopify.com/s/files/1/0440/1915/5109/files/commercial_invoice_template_excel_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/0329/7438/files/nier_automata_material_farming_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/7487/9641/files/14718230626.pdf
    • https://cdn.shopify.com/s/files/1/0434/6000/1957/files/buzizon.pdf
    • https://cdn.shopify.com/s/files/1/0431/7177/4615/files/68629493648.pdf
    • https://cdn.shopify.com/s/files/1/0435/8340/6239/files/calculus_without_derivatives.pdf
    • https://cdn.shopify.com/s/files/1/0429/8860/1503/files/66427009493.pdf
    • https://cdn.shopify.com/s/files/1/0439/3785/7691/files/sexulivavovilatozej.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_off00005074.bin
c24eaf8743128a9c65e5ccfeee1a9d31ee6bbeac0a9687025716058847a7017b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5074 5284 bytes
font_01_sfnt_off00006259.bin
5bb16997e37ce3c3da4229f669ff06128d5437bd3975c2456ede2fc9bc0b6564
pdf-font-stream PDF embedded font (sfnt) at offset 0x6259 10704 bytes