Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c6eca2fccd238f…

MALICIOUS

PDF

41.3 KB Created: 2021-04-25 13:03:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 69181c2f73b76328aeb1440a4fa941c4 SHA-1: dca9c5fea312a9eb7fbaad4e236910d39617bace SHA-256: 31c6eca2fccd238fefb588ea8fe7b1c0b7b2c5bd9c8c13fe9a6ab30111f81e54
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains, specifically advertising 'game hacks' for Roblox. One of the primary links, https://netcdn.xyz/app/431946152/hack-roblox-simulador-de-levantamiento-de-pesas-3-game-hack, is flagged as a malicious redirector. The document body, though partially corrupted, also contains this URL and other links to domains hosting PDF files related to game exploits, suggesting a lure to download further malicious content or visit compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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/hack-roblox-simulador-de-levantamiento-de-pesas-3-game-hack In PDF document text
    • http://wattkit.com/images/unpatched-cheat-engine-roblox.pdfIn PDF document text
    • http://wattkit.com/images/cheat-codes-for-building-simulator-roblox.pdfIn PDF document text
    • http://wattkit.com/images/how-to-hack-a-account-in-roblox-2021.pdfIn PDF document text
    • http://wattkit.com/images/can-you-use-cheat-engine-in-2021-roblox.pdfIn PDF document text
    • http://wattkit.com/images/unkown-cheat-roblox-exploit.pdfIn PDF document text
    • http://wattkit.com/images/how-to-get-free-robux-april-2021.pdfIn PDF document text
    • http://wattkit.com/images/youtube-yammy-xox-roblox-hacking.pdfIn PDF document text
    • http://wattkit.com/images/roblox-hack-online-roblox-hack-2021.pdfIn PDF document text
    • http://wattkit.com/images/roblox-asset-download-for-shirt-template-free.pdfIn PDF document text
    • http://wattkit.com/images/roblox-emergency-response-cheats.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_003_off00004380.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4380 24704 bytes
SHA-256: 852a2cecbb79b3f28f3056c458cc4aebfa2761f867353b8d8c87a61b0732a135
font_01_sfnt_off00007ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA9 19588 bytes
SHA-256: 7a8c49d703c006db476a644b8505c5bb946b86b83a0f108ca0c612dd1190dc7e