Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ba1440f22a5868…

MALICIOUS

PDF

35.6 KB Created: 2021-07-04 08:38:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 30746f0327f3bfc5f0c71d00a62003f9 SHA-1: 56bd1e8da46283f592747c1c2aa8eeae753f3b75 SHA-256: 31ba1440f22a58689ee19eccaa73eb5235e9b35e045c67feb1603b7d97d28c89
160 Risk Score

Malware Insights

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

The PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.tw/app/406889139/free-diamonds-coin-master-game-hack. The document body and heuristics indicate a lure for game-related cheats or hacks, suggesting a social engineering tactic to trick users into clicking malicious links. While no scripts were explicitly extracted, the PDF structure and embedded links suggest potential exploitation or redirection to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/free-diamonds-coin-master-game-hack In PDF document text
    • http://library.itekes-bali.ac.id/repository/game-cards-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/play-kill-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-do-you-make-a-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-roblox-gift-cards-not-used_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-variable-modifier-script-cheat_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/cool-outfits-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/hacks-for-fallen-that-actually-work-roblox_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-emergency-response-liberty-county-hack-script_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-cheat-on-roblox-with-mhs_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-westover-hacks_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-coins-and-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/robux-2021-free_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-free-hats-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/hack-mining-simulator-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-multiplayer-minecraft-server_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/como-sacar-buen-puntaje-en-juego-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/everything-free-on-roblox_GM431946152.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_002_off0000338e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x338E 23284 bytes
SHA-256: b607b2e594cda61616343a2e8da8859a0e8358374bf6959af6c3ffdce1e58ff0
font_01_sfnt_off000067c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67C9 18600 bytes
SHA-256: da824c8de7a59d01d725a44d62aa23261c44ef626b00917327570bf01bcd9ba0

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