Malicious PDF — malware analysis report

Static analysis result for SHA-256 3122a43b3aa9a650…

MALICIOUS

PDF

39.9 KB Created: 2021-05-13 03:45:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c47aceca9bef0be38568ce4681ae2d9c SHA-1: f2486636e632f9eccfbafba20460f0a44bcce63d SHA-256: 3122a43b3aa9a65002f8ce06227aa1626c0c865612ba6fbe86eff97ebe8b918f
170 Risk Score

Malware Insights

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

The PDF document displays a fake CAPTCHA and a lure for 'Roblox Free Items 2021' to entice users to click on a malicious link. This link leads to a known malicious redirector infrastructure, suggesting the primary goal is to deliver a second-stage payload. The document's content and heuristics indicate a social engineering attack aimed at tricking the user into executing further malicious actions.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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/roblox-free-items-2021-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_off000034bb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34BB 31216 bytes
SHA-256: 9e34332d26d4f8aa0c86a333b7a7891f58d7247503b63e3b54e8a43246d9046c
font_01_sfnt_off00007951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7951 18716 bytes
SHA-256: 1ac7dfea826aa1cf6bdd8a8871d75981f44760a1c5f47be9d1d913bfc788d2a8

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