Malicious PDF — malware analysis report

Static analysis result for SHA-256 935d339de3a34fe3…

MALICIOUS

PDF

34.4 KB Created: 2021-07-04 12:58:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ef497116b9018504fdf2558782ed12d7 SHA-1: 4f10c45dd323c7596ae031729c5a498ee6cd7741 SHA-256: 935d339de3a34fe31bab4a090191300c574674b84b27da7841483c70e3ec8ff9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to potentially malicious infrastructure, masquerading as game hacks and free items. The primary lure URL is http://netcdn.tw/app/431946152/free-stuff-on-roblox-2021-game-hack, which is flagged as a malicious redirector. The document body and embedded URLs suggest a social engineering tactic to trick users into downloading further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/431946152/free-stuff-on-roblox-2021-game-hack In PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-link_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-robuxs-by-bananaman329_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-roblox-accounts-with-robux-and-builders-club_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-tbc-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-free-lua-executor_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/minecraft-realms-free_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/best-free-avatars-on-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/cheats-for-murder-mystery-2-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-free-gamepass-script-october-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-hack-no-human-verification-safe_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-pet-simulator-hacks_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-free-play-on-google_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-hack-roblox-accounts-2021-august_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-free-spins-on-coin-master-without-verification_GM406889139.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
font_00_sfnt_off00002daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DAA 22760 bytes
SHA-256: b92067d179c18517bcddf8c4da737e342db054201598183c94f5e2c838d5b513
font_01_sfnt_off00006052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6052 19296 bytes
SHA-256: 300e543f1ae6fe51c52c5bb94c5fb7f52b2b8c409bfd9a689e6f45e1d207daf4

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