Malicious PDF — malware analysis report

Static analysis result for SHA-256 289da1c256cb62a8…

MALICIOUS

PDF

37.0 KB Created: 2020-08-31 09:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2982ed3d93598bd178152d6f3bc4cdc SHA-1: d1ae29f7463e3f6fbb6c4da4479dd69c1a529ed8 SHA-256: 289da1c256cb62a8ee33347164b45966deee2c030c31dff71f1b05f0497b017d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF document contains a link that redirects to a malicious URL, disguised with a seemingly innocuous keyword. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this behavior. The document also exhibits characteristics of a link farm, with numerous external PDF links, as indicated by 'PDF_SEO_LINK_FARM'. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering through a deceptive link.

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=canyon+bunk+bed+instructions
    • https://static.usrfiles.com/ugd/bae363_f74a1e89251844638a5bf5df2912e7ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_fef08631cb184895a3de57d13cc79efe.pdf
    • https://static.usrfiles.com/ugd/e02969_e16fc82006f949c78f59c41f1f812403.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6820/files/medicare_part_b_fee_schedule_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/2127/9138/files/xovumobota.pdf
    • https://cdn.shopify.com/s/files/1/0435/5738/8440/files/94832195879.pdf
    • https://cdn.shopify.com/s/files/1/0432/6644/1376/files/90951187191.pdf
    • https://static.usrfiles.com/ugd/b8c837_a2a807880bc94fa796a6c93447feb93f.pdf
    • https://static.usrfiles.com/ugd/12f4eb_73da9c676cac46758499953e0185a061.pdf
    • https://static.usrfiles.com/ugd/b8c837_27e87ce0f6984bddb613b0fbd10ace6e.pdf
    • https://static.usrfiles.com/ugd/b8c837_8c7fedc56ae14cd1a0b5a23f58cdc1f3.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b25b80b365d4e4b9469ac05a284220d.pdf
    • https://static.usrfiles.com/ugd/b8c837_a8f2906ae8a04caa8d393c15974df4cc.pdf
    • https://static.usrfiles.com/ugd/83e24f_ee0e1b10a57d4a5baa0334db06070874.pdf
    • https://static.usrfiles.com/ugd/f0f215_e011ce0e636d4d9eb485334a908e5c96.pdf
    • https://static.usrfiles.com/ugd/b4f0c6_828aac8742024817bd81a7d764638aff.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_off000051cc.bin
49cbd6d43489ed1bbc4b53c8401e3bd8e5096cf9c77b0026769b59f82abeac94
pdf-font-stream PDF embedded font (sfnt) at offset 0x51CC 5112 bytes
font_01_sfnt_off00006346.bin
83522cb5d78a5e329cbdf5b457553608a025b9382787bf3447178aaf784269d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6346 10624 bytes