Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9273a701c4777c…

MALICIOUS

PDF

38.5 KB Created: 2020-08-29 23:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 509222e004636de09c694c498c039867 SHA-1: fe9486eee43c6467479c6675026c0b939b6aa468 SHA-256: 5c9273a701c4777c03c8d3da35c2985e061a2ac752062fae6a8c59494d632f71
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=10+000+reasons+sheet+music+in+c'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which are benign but likely serve to obscure the malicious one. The ML classifier strongly indicates maliciousness, suggesting the document's primary purpose is to redirect users to harmful content.

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.cc/wix?keyword=10+000+reasons+sheet+music+in+c
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_30e5cc5025a64bebbebfacf31c504f08.pdf
    • https://static.usrfiles.com/ugd/b8c837_df6601f92c884f0786c7ba4c1e132fd1.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb28072733b24862b11105ec8d3431bb.pdf
    • https://static.usrfiles.com/ugd/19103d_6d401119e2aa4ed09d8b034d48a7d786.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc22890e19354a8c95a814f9dc2f3ac0.pdf
    • https://static.usrfiles.com/ugd/b8c837_33765d4fc28e49078b0ea7fe8dc490ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_20459afc700a42488d6fbbe7b22ba76b.pdf
    • https://static.usrfiles.com/ugd/b8c837_9025036dbb73489ea427cea1acc51b50.pdf
    • https://static.usrfiles.com/ugd/63d3ad_ff40dec291964a39a9d1ff02fd487512.pdf
    • https://static.usrfiles.com/ugd/b8c837_53ed3c5fc2ae476893ca132eca976b80.pdf
    • https://cdn.shopify.com/s/files/1/0448/9838/6087/files/cognos_11_report_studio_permissions.pdf
    • https://cdn.shopify.com/s/files/1/0436/5837/9417/files/nios_assignment_front_page_format.pdf
    • https://cdn.shopify.com/s/files/1/0463/3116/6881/files/trauma_informed_schools_best_practices.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_off000058e0.bin
05a73482b183643b0ac9ecf88752acdada20e2e81a08cc2bb7699efa9235db6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x58E0 5104 bytes
font_01_sfnt_off00006a06.bin
517573b2301f91573238a06b8006e34d86c11677d9cdebd4882b456738545a90
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A06 10336 bytes