Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b38d91eb6c36faf…

MALICIOUS

PDF

46.0 KB Created: 2020-08-30 18:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa4b5808826e7cac061bb9e3d447f22f SHA-1: ca8eacb61a386f1d36bbfb4fae614fd95e723385 SHA-256: 4b38d91eb6c36faf8374c3a08cdd47ef1b3aace5aacad2b4a9437baa94a8280b
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external links, suggesting a link farm or phishing attempt. The primary malicious URL identified is ttraff.ru, which is known to host redirectors. The document body contains garbled text but also includes the URL that triggered the heuristic, reinforcing the malicious link presence. No scripts were extracted from this sample.

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.ru/wix?keyword=removing+roms+from+retropie
    • https://static.usrfiles.com/ugd/b910ae_dbf7e972655e49e59f6db16aa4eefffe.pdf
    • https://static.usrfiles.com/ugd/b8c837_d8e8d6012ea549288043a7e5f2d85829.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_7de709817d2242529565ae97e2f8edda.pdf
    • https://cdn.shopify.com/s/files/1/0431/2200/0029/files/wakinovopakirobu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6464/6042/files/67417238965.pdf
    • https://cdn.shopify.com/s/files/1/0432/8603/6646/files/software_engineering_books_for_bsc_computer_science.pdf
    • https://cdn.shopify.com/s/files/1/0434/0423/0805/files/inorganic_nanomaterials.pdf
    • https://cdn.shopify.com/s/files/1/0436/4523/9456/files/7667788239.pdf
    • https://cdn.shopify.com/s/files/1/0429/5193/4108/files/lobanimekosid.pdf
    • https://static.usrfiles.com/ugd/b8c837_f3865c41721046c88660cd18f848b0de.pdf
    • https://static.usrfiles.com/ugd/5be868_67f22ca943434e07ad308f91e6926eca.pdf
    • https://static.usrfiles.com/ugd/bae363_0dd94826f8c7446d84cf323c5bd9db18.pdf
    • https://static.usrfiles.com/ugd/b8c837_7939f6dd75bb4f98a9d5adffb1a465b1.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_off00006475.bin
98c0fab37f5dbae838fd2c8e17adabbb097dee2734cb5156a505e249261055c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6475 4832 bytes
font_01_sfnt_off000074d9.bin
d1271de39382cf3cafaecb4fef95ceb6d1300c3a27c344a75776efb7dc45fef1
pdf-font-stream PDF embedded font (sfnt) at offset 0x74D9 12432 bytes
font_02_sfnt_off00009d2e.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D2E 4324 bytes