Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed25e5fbcff77faa…

MALICIOUS

PDF

68.7 KB Created: 2020-08-31 01:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1899e78d13af61784b7ab5baf814d1e SHA-1: 36ae0e7f48c7c064e8d5ea66b5a0a17774ae5f63 SHA-256: ed25e5fbcff77faa8bafc82f254c689234561794a829ef969c297f5db1f6e270
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=critical+race+theory+pdf'. This indicates the document's primary purpose is to redirect users to a malicious site, likely for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated and unreadable.

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=critical+race+theory+pdf
    • https://static.usrfiles.com/ugd/b8c837_01c0d35c53b741568e686c0c6e08911c.pdf
    • https://static.usrfiles.com/ugd/f967ac_41066f984e8245ce91af2a3b06621367.pdf
    • https://static.usrfiles.com/ugd/0d2908_5fbab09ceb564d04ab657db986309ae1.pdf
    • https://static.usrfiles.com/ugd/7f929b_58f4761d496d427da804119baa6431c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_a36c8583f62e4a5581e4a3c14d6868a1.pdf
    • https://static.usrfiles.com/ugd/26938b_0f9beeee109d419f9cbe48358b6d2bdc.pdf
    • https://static.usrfiles.com/ugd/8a419d_62ca8c0fddd24a3d82f2134388be76da.pdf
    • https://static.usrfiles.com/ugd/b8c837_b85ed15068ba4997ba7323f1e4302bd5.pdf
    • https://static.usrfiles.com/ugd/73c254_5457dfb0b1bb407b902d6a665be4f788.pdf
    • https://static.usrfiles.com/ugd/c20ea7_71ae0dbe65564dddbc6e943733b91586.pdf
    • https://static.usrfiles.com/ugd/07ef24_3187bb80ab7c495a90ef5e0a74381dfe.pdf
    • https://static.usrfiles.com/ugd/b8c837_3020d7d9c3fa4affaa29f456dc8a2463.pdf
    • https://static.usrfiles.com/ugd/0c41e7_296718c248ff48b19a9c3714da5cbd5d.pdf
    • https://static.usrfiles.com/ugd/314c35_26dec5aaf4dd4f80ab3ffada99535f08.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_off0000d117.bin
e88c97aaaac1a80886d280e3d0862f3438bd0febf127d5c1e59f38b77458fded
pdf-font-stream PDF embedded font (sfnt) at offset 0xD117 5072 bytes
font_01_sfnt_off0000e252.bin
1b542ef6f2d1d4e20d40346ab899af503b1cd85a6749429bc0df0d3ae6687a4c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE252 10720 bytes