Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e5a908bb5ae97b…

MALICIOUS

PDF

32.3 KB Created: 2021-07-20 01:40:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6d59561f3eea364e9a6bb3b17772eeb7 SHA-1: 4f442fdc8b0562bd78864b1cc304440f760d7758 SHA-256: b8e5a908bb5ae97b4ef82a71dd026231b95177136320a3fc4b54490d3c7703a5
160 Risk Score

Malware Insights

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

The PDF document contains multiple links that redirect to a malicious domain, masquerading as a generator for free in-game currency (Robux) and other game-related items. The heuristic firings indicate that these links point to known malicious redirector infrastructure and are part of a lure for game hacks. The document body explicitly mentions 'Earn Free Robux For Roblox' and includes a call to action to access a 'ROBUX GENERATOR', reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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
    • https://jasab.fr/images/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://jasab.fr/images/free-robux-master_GM431946152.pdfIn PDF document text
    • https://jasab.fr/images/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://jasab.fr/images/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://jasab.fr/images/free-minecraft-skin-maker_GM479516143.pdfIn PDF document text
    • https://jasab.fr/images/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • https://jasab.fr/images/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://jasab.fr/images/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • https://jasab.fr/images/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://jasab.fr/images/how-do-you-get-minecraft-for-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
font_00_sfnt_off000029a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29A4 22428 bytes
SHA-256: 9d106ea37d2d3d256a149aaba4f812d9694fb2dfb3d39ce832b801c17133c0bb
font_01_sfnt_off00005b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B9F 18504 bytes
SHA-256: ff3c46e153643819b6f5f78252fa4224f2b94fd95d76ee426fe9153007a53f2c