Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a96b11dc56d3eb6…

MALICIOUS

PDF

52.5 KB Created: 2020-08-29 16:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4f24ffc26c1c26949215296b0f84793 SHA-1: 42563ff1eea2b1fb4eb4e394a8b956a164cd65bf SHA-256: 1a96b11dc56d3eb681f0d388326f47059b91dc1330eb900f44e764c522ed643f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious by an ML classifier and contains numerous external links, a technique often used for SEO spam or to distribute further malicious content. One of the embedded URLs, https://ttraff.com/wix?keyword=janice+griffith+wikipedia, is identified as a known malicious redirector. The document body contains garbled text but also includes the same malicious URL and several Shopify URLs, some of which are benign. The primary attack pattern appears to be leveraging a link farm within the PDF to redirect users to malicious infrastructure.

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=janice+griffith+wikipedia
    • https://cdn.shopify.com/s/files/1/0435/3641/6936/files/master_swing_trader.pdf
    • https://cdn.shopify.com/s/files/1/0439/5958/2878/files/characteristics_of_partnership_business.pdf
    • https://cdn.shopify.com/s/files/1/0435/6086/1845/files/army_apft_walk_score_chart.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2906/files/neweji.pdf
    • https://cdn.shopify.com/s/files/1/0433/5278/5055/files/jodesenixozaz.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed06e3a29f884498b7e82be6ed423bf7.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb0b068f3bd44d729797f132ed3b1342.pdf
    • https://static.usrfiles.com/ugd/b8c837_136a7fb3610b45b89b3d2de77bad39f3.pdf
    • https://static.usrfiles.com/ugd/913720_0aeecf1cc6b94874b2fca716844f00bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_96b525a2971e46f187e573606558a986.pdf
    • https://static.usrfiles.com/ugd/b8c837_85196644eabb4488bdd8950c3fdd374f.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_off000072ef.bin
8aee512daa0a9824adbc89838d9b9ffe0f829eda2b11ff1a29f86403ca4ceb41
pdf-font-stream PDF embedded font (sfnt) at offset 0x72EF 5352 bytes
font_01_sfnt_off00008529.bin
250e23112097d52616b0f1db7debc9be9db1398e3e568193fd6c3de9ae5e240d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8529 10596 bytes
font_02_sfnt_off0000a978.bin
aa47e41a77367c519c74635e7b1ce95e8b4c72638390eddb7757f6755fd268db
pdf-font-stream PDF embedded font (sfnt) at offset 0xA978 18260 bytes