Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e34b70508a90e7…

MALICIOUS

PDF

36.3 KB Created: 2021-07-06 14:34:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4d4764fc13995e5e1152dc19ff8fedcb SHA-1: 097ec47c48fe7a3ebbbcb364918e38dfa261e8cc SHA-256: b2e34b70508a90e715302924aa6f24b0f460b2c48924cc4ac0e5db92d6a3a18d
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users into clicking on what appear to be "free generator" or "game hack" sites. The primary redirector URL, http://netcdn.tw/app/431946152/free-robux-giveaway-game-hack, is flagged as malicious. The document body, though partially garbled, also contains this URL and references to "free Robux" and "game hacks", reinforcing the lure. The presence of many external PDF links suggests a link farm or SEO poisoning tactic to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/free-robux-giveaway-game-hack In PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/free-robux-hack-on-ios_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/free-gamepasses-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-to-hack-roblox-games-cheat-engine_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/trickynicky-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/iron-man-script-roblox-hack_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-doi-hack-in-roblox-games-to-get-gold_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-do-you-get-free-admin-in-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/roblox-royalty-free-music-ominous-60_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-to-hack-roblox-to-where-you-can-fly_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/roblox-dragon-ball-after-future-hack_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/wish-robux-hack_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/free-admin-roblox-commende_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/free-robux-easy_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/account-hacker-roblox-pastebin_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/roblox-cheat-engine-scripts-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/free-roblox-accounts-usernames-and-passwords-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-to-hack-money-in-roblox-vehicle-simulator_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/como-descargar-roblox-hackeado-con-robux_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
font_00_sfnt_off00003587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3587 22636 bytes
SHA-256: a526d0469e4ce2df93b5c58d90ab295d12279b14af603d1596639fa2ffc4765a
font_01_sfnt_off00006813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6813 19296 bytes
SHA-256: f9d47c8927f06aca09230474687c7e62d7780f8e0224e11b3e175debbf54a907

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