Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd3b128ab44f47e…

MALICIOUS

PDF

35.8 KB Created: 2021-05-13 11:17:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 592f3f77da3e5e6ae8a2842d7df2a3ef SHA-1: 857d68d69597c95ccc640f2e94fb8364426910d5 SHA-256: ffd3b128ab44f47eb9510105133d9a3bc2d171e89f11f00bbc9eacb8d60abdb3
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link to a known malicious redirector disguised as a 'free generator / game hack'. It also displays a fake CAPTCHA to trick the user into interacting with the malicious link. The document body and embedded artifacts suggest a lure for game-related cheats, which is a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier clean score 0.0265

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://netcdn.xyz/app/431946152/rbxcity-free-robux-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
stream_003_off0000321b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x321B 24636 bytes
SHA-256: 65b4a3e7f4f3b4635c4819229a7d468794e8a9dd2e95c930ece11707bbdcec67
font_01_sfnt_off000069e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69E6 18420 bytes
SHA-256: f6fda3bfe323f9f0676c079c6b9141a3a072b0621584b37e36c0c9937e592518