Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ac698ea7c04533…

MALICIOUS

PDF

29.1 KB Created: 2021-07-21 00:42:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2e3bdbaabf147021d68a4a31c07e76fb SHA-1: 67d7564a28050c93187681356fe9ba38aa97bb61 SHA-256: 55ac698ea7c04533516589976bc5ed4b70ae7ba8df81517737ea4dd1842e3b1e
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a game hack redirector lure, pointing to a URL associated with malicious infrastructure. The document body and embedded artifacts suggest a lure for free Robux, a common tactic in online scams. While no scripts were explicitly extracted, the PDF structure and the nature of the lure indicate an attempt to redirect users to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier clean score 0.0553

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • 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 http://netcdn.tw/app/431946152/free-robux-group-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E96 22216 bytes
SHA-256: e66240faaa5b32ec75a2e482c2666df1a6d63db191700fcb39765e77edfebb95
font_01_sfnt_off00004fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FB0 18376 bytes
SHA-256: 2a1b1194c9c7ba03f9173fc8227a1f433bf3cd1edeaa844f73d355bc692a0bd1

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