Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ffbd4c24cd1fe2a…

MALICIOUS

PDF

49.3 KB Created: 2021-06-03 08:25:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 049f1456040869d5b02bd5269b652271 SHA-1: c76dbf94b5d429050062d5a9b88ccc2bd43b231d SHA-256: 6ffbd4c24cd1fe2aa524229999e5e02735e214cde46dff866da3c3233055887a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users to websites offering game hacks and free in-game currency, such as robux. One prominent link directs to 'netcdn.online', which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to these lures and embedded URLs, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.online/app/431946152/girl-roblox-avatar-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-coin-master-game_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/good-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-pics_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-free-edition_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/tiktok-free-games_GM835599320.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-apk-hack-mod-download_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-invite-friends-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/online-coin-master-free-spin-app_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-hack-in-arsenal_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-spin-reward-links_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_004_off00005232.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5232 29168 bytes
SHA-256: f0d54154afff01dc8051c82e82065f92abe387a8f15673bbc1d555b319b9721d
font_01_sfnt_off0000943b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x943B 2824 bytes
SHA-256: 1d0cb1023eaa225682b8e7a2c8df4e4c96545ba7eedaf3d9844e51183e9ca189
font_02_sfnt_off00009de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DE8 18352 bytes
SHA-256: 40a6e93de1ad20fd8dc51d83f0b41a224bcf2e60033ebf60b5fe8b6dd784a017

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