Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b8ff07c86b7933…

MALICIOUS

PDF

36.9 KB Created: 2021-05-23 21:09:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 21306f92b8104b963093c09f1ef30aa9 SHA-1: cb4bcef5d384b3d4c0268347fb82455c60e76e28 SHA-256: e7b8ff07c86b7933babd57a10d25ce3b21fe0230d11810045dc22aa415f1bb91
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites that are flagged as malicious redirectors, specifically promoting 'free generator' or 'game hack' lures. The document body also contains similar URLs and a call to action, reinforcing the phishing and redirection attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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 https://netcdn.xyz/app/431946152/rbx-free-robux-game-hack In PDF document text
    • http://gruporamos.do/images/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://gruporamos.do/images/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://gruporamos.do/images/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://gruporamos.do/images/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://gruporamos.do/images/minecraft-mac-free_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_off0000349a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x349A 25452 bytes
SHA-256: a7a76e39afa1237f750aa8ac17fcfaa9dd9af0208e0701fde7ed0e7fde34ff35
font_01_sfnt_off00006ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FFC 18012 bytes
SHA-256: 03f7603bc8a5695bbd0c39958af3fcfd5a932cbc13eba7563a8e8ca8b5ca4208

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