Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27ef3d9126d1505…

MALICIOUS

PDF

42.3 KB Created: 2021-05-02 15:14:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5c8b28065395388926ec694c65db0022 SHA-1: 5438ef7e0941740a377db972b9d61f87f4a7b455 SHA-256: d27ef3d9126d1505bdd1807e665d0ad7b8821b62de1ec317d97bbd9e82d54b1a
160 Risk Score

Malware Insights

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

The PDF contains multiple links to websites offering game hacks and exploits, specifically targeting Roblox. The heuristic firings indicate these links lead to malicious redirectors and are designed as lures for users seeking cheats. The document body, though partially corrupted, contains references to these lures and embedded URLs, strongly suggesting a social engineering attack to drive users to potentially malicious 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/roblox-unlock-all-gamepass-free-pastebin-game-hack In PDF document text
    • https://fridaytravelnepal.com/userfiles/files/how-too-hack-roblox-carlos-amin-house.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/roblox-best-hack-for-jailbreak.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/all-free-promo-codes-in-roblox-2021.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/arts-78-roblox-hack.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/descargar-roblox-hackeado-para-android-2021.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/no-clip-hacks-roblox-wall-hack.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/how-to-get-free-robux-on-roblox-on-ipad-2021.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-buying-roblox-exploit.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/robux-hack-inspect.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/roblox-free-girl-body.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_off0000420f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x420F 27060 bytes
SHA-256: 3bf6bbc1c1855cfdb885d01d7e54f9ad09a893fb8d9c02be6a994643615891ff
font_01_sfnt_off000080aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80AA 19344 bytes
SHA-256: e2adeee205a7deda5f6c83fc85d19d2251300e6c444a199b2b03b298e745862b