Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ef74e2691a9123…

MALICIOUS

PDF

48.4 KB Created: 2021-05-19 17:52:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fbd2780d8019c52d8c80018e70c2c78a SHA-1: 10db8a0d9a9d6922727126ff658d7ea607f95092 SHA-256: 24ef74e2691a91235b95e2073d45691eb965e4ac0cba5618d05beac68d548ac5
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links and a link farm, specifically targeting users interested in game hacks and generators. The document body and extracted URLs point to lures for free game currency, such as Robux, directing users to potentially malicious websites. No scripts were extracted, but the primary attack pattern involves social engineering through deceptive content and redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/free-robux-without-any-verification-game-hack In PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/free-roblox-generator_GM431946152.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/robux-earning-websites_GM431946152.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/is-roblox-free-on-xbox_GM431946152.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/legitimate-coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/coin-master-game-hack-app-download_GM406889139.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/how-to-get-roblox-credit-for-free_GM431946152.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/coin-master-hack-version-download-ios_GM406889139.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/robux-cheat_GM431946152.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/roblox-comroblox_GM431946152.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/coin-master-free-spin-app-2021_GM406889139.pdfIn PDF document text
    • http://www.majdoorkalyansamiti.org/uploaded_files/userfiles/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ac1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AC1 30432 bytes
SHA-256: e74bc4a960ad28352b090cc918fee8d36e893c0c77341f160c495a202b46c94f
font_01_sfnt_off00008eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EBA 2828 bytes
SHA-256: db1860fd79a3f2cbe32e2bada3ba4c68a2d581b7a24294387cd777233cc9cef6
font_02_sfnt_off00009871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9871 19144 bytes
SHA-256: f37955fcb4845292a10cf385cf7825d095aa25907e4328d2f78dbaed4e94b6f7