Malicious PDF — malware analysis report

Static analysis result for SHA-256 f541ebaefdd82646…

MALICIOUS

PDF

46.9 KB Created: 2020-08-31 16:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d8c6d0e2d24ed33fae710c5c44d3185 SHA-1: dd55827c39299d2b14d49b2d56626ab3d641c83f SHA-256: f541ebaefdd82646a2a4537a4c66e3bc7521b4ce316c0c9b95c3209639377a14
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a lure related to an employee warning, combined with a visual download button, aiming to trick the user into clicking a link. The primary link, 'https://ttraff.ru/pify?keyword=employee+final+written+warning+template', is identified as a malicious redirector. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDFs. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the payload.

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=employee+final+written+warning+template
    • https://static.usrfiles.com/ugd/c1108c_484f96dcc3024176bdfa54d84957fa36.pdf
    • https://static.usrfiles.com/ugd/b8c837_e9b01d07d95c4b9e85287a58ed98cc9e.pdf
    • https://static.usrfiles.com/ugd/b916f4_b6c06717b42a4dd090485e88bfb37b21.pdf
    • https://static.usrfiles.com/ugd/9cc572_62130e98220244c69091b1192763afb5.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_3744690decc04f5990f39b7aac5e85b9.pdf
    • https://cdn.shopify.com/s/files/1/0434/8100/6244/files/74867905790.pdf
    • https://cdn.shopify.com/s/files/1/0434/0721/2694/files/1161849705.pdf
    • https://cdn.shopify.com/s/files/1/0431/5296/5789/files/xanathar_s_guide_to_everything_subclasses.pdf
    • https://cdn.shopify.com/s/files/1/0435/0273/1430/files/46479067188.pdf
    • https://cdn.shopify.com/s/files/1/0432/1945/2063/files/juvisizozexuzo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6939/9452/files/vakikikirigetibob.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_off00006d9f.bin
8ac8fc518cec3f598797f97edcde05b4af91b3ba60c460b7bce7b3e46e5eb1a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D9F 4980 bytes
font_01_sfnt_off00007e8e.bin
f6171fc72fc1b9b0d19fcd6d3e7b45c10bc0019e76090ef20341d8c676ceec96
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E8E 10004 bytes
font_02_sfnt_off0000a0bf.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xA0BF 4324 bytes