Malicious PDF — malware analysis report

Static analysis result for SHA-256 b76beec6676b2478…

MALICIOUS

PDF

50.0 KB Created: 2021-05-12 17:32:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 99cb943bc69fea49a3fd6a59194d363a SHA-1: 08a8589f22baac34d78377002a05e0c56aa3ca1d SHA-256: b76beec6676b24789d28eeb1742d6400a898f640ec7cf5f31bfe4285bb8af6a3
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into clicking on what appear to be game hack or free currency generators. The primary link, 'https://netcdn.xyz/app/431946152/how-to-get-free-robux-instantly-game-hack', is associated with known malicious redirector infrastructure. The document body and heuristics indicate a scam or phishing attempt, likely using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8594

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/how-to-get-free-robux-instantly-game-hack In PDF document text
    • http://www.hotel-seminaire.com/images/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/how-to-hack-coin-master-using-es-file_GM406889139.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/how-to-play-minecraft-with-friends-for-free_GM479516143.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/minecraft-pe-hack-client-ios_GM479516143.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/aternos-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/how-to-hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/static-moonactive-net-link_GM406889139.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/get-free-spins-link-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/coin-master-hack-2021-app-download_GM406889139.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/free-face-roblox_GM431946152.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/games-like-coin-master_GM406889139.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/how-to-get-free-roblox-hair_GM431946152.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.hotel-seminaire.com/images/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://wolfzscriptsIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004be9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BE9 25012 bytes
SHA-256: fb277bef051b0d44304ef57ffde891b891495a255e67774fcefe9aee974869e3
font_01_sfnt_off00008392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8392 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off00008d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D3E 7448 bytes
SHA-256: a76ff9b4805dcff342f7268a16e2e3c2ff2b31b96c381fe4deb6ceea777bce90
font_03_sfnt_off00009f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F20 18764 bytes
SHA-256: 19eb0a1aeef998e7db468722215b94b9b4bc3d0fba007f3cca2c49ee7cc94cee

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