Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2524718f8b223d…

MALICIOUS

PDF

31.2 KB Created: 2021-07-19 00:12:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 86ede88446f8a5b244b89e1b06fa29e4 SHA-1: f27378ae76322734d747fb9c1e042a99615ec368 SHA-256: 5c2524718f8b223da40cfe0946c94edede44f74cb3fe36b9fea7bd9143a0913e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains and explicitly mentions 'free generator / game hack' and 'Earn Free Robux For Roblox', indicating a lure for a scam. The presence of embedded URLs and the ML classifier's high confidence score support this assessment. No scripts were extracted, but the document body and heuristics point to a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9393

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/earn-free-robux-for-roblox-game-hack In PDF document text
    • http://precitool.ch/images/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • http://precitool.ch/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://precitool.ch/images/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://precitool.ch/images/minecraft-build-hacks_GM479516143.pdfIn 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_002_off00002595.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2595 22520 bytes
SHA-256: 97a7b0f8d04d7b2a67c1d398480ab9aa08b2c45d2158a534c48934fc5d38166c
font_01_sfnt_off0000576f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x576F 18504 bytes
SHA-256: ff3c46e153643819b6f5f78252fa4224f2b94fd95d76ee426fe9153007a53f2c

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