Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ebd61f17f7c043f…

MALICIOUS

PDF

43.0 KB Created: 2021-04-28 21:37:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 75579e83cde677ff3120e97c69e3bb26 SHA-1: e75546f7fd72836c832df7ee307a879cc044adb7 SHA-256: 3ebd61f17f7c043f61bba7dcd843bb4652a6227170618e47e9505c9886044ce5
160 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, including one identified as a malicious redirector. The document body and heuristics suggest a lure for a 'game hack' which likely leads to a malicious site or download. The presence of embedded URLs and the ML classifier strongly indicate malicious intent.

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/undetected-cheat-engine-for-roblox-game-hack In PDF document text
    • https://www.bolsoshf.com/ckfinder/userfiles/files/how-to-make-a-free-robux-hack.pdfIn PDF document text
    • https://www.bolsoshf.com/ckfinder/userfiles/files/how-to-hack-other-roblox-accounts.pdfIn PDF document text
    • https://www.bolsoshf.com/ckfinder/userfiles/files/boku-no-roblox-remastered-hack-chose-quirks.pdfIn PDF document text
    • https://www.bolsoshf.com/ckfinder/userfiles/files/roblox-2021-april-fools-hack.pdfIn PDF document text
    • https://www.bolsoshf.com/ckfinder/userfiles/files/uirbx-club-free-robux.pdfIn PDF document text
    • https://www.bolsoshf.com/ckfinder/userfiles/files/roblox-money-hack-cheat-engine-63.pdfIn PDF document text
    • https://www.bolsoshf.com/ckfinder/userfiles/files/roblox-walk-through-walls-cheat-engine-jailbreak.pdfIn PDF document text
    • https://www.bolsoshf.com/ckfinder/userfiles/files/como-hackear-conta-de-roblox.pdfIn PDF document text
    • https://www.bolsoshf.com/ckfinder/userfiles/files/roblox-full-throttle-hack.pdfIn PDF document text
    • https://www.bolsoshf.com/ckfinder/userfiles/files/roblox-noclip-no-cheat-engine.pdfIn PDF document text
    • https://freerobux.cyouIn 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_off00004340.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4340 27900 bytes
SHA-256: 4635c941765cd932270978299c61accf137eb4e271b85035187a8bbac2e1a8d3
font_01_sfnt_off0000839a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x839A 19216 bytes
SHA-256: b25668668ad5c1286d2dd3a3372fb06eca282269517438e1a9a51f954ecbe8dd