Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f96b51887c3c08…

MALICIOUS

PDF

34.4 KB Created: 2021-07-03 19:20:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 91063040407671c6c077f99f41ebf388 SHA-1: 20197e24d67a2c44d4c9554ca40f96530cc9b1ab SHA-256: 42f96b51887c3c08c400a8d93d2400df1cbc15df7608ecd1ea4467241a8d2363
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains an external URI pointing to a suspicious domain, and the ML classifier strongly flagged it as malicious. The document body, though partially corrupted, contains references to game hacks and cheats, indicating a social engineering lure. The presence of numerous embedded URLs further supports the malicious intent to redirect users to potentially harmful content.

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/coins-master-hack-game-hack In PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-spin-hack-trick_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/irobux-com-redeem_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-fly-hack-code_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/robux-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/pop-slots-free-vegas-casino-slots-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/rbx-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/cheat-pour-mad-city-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/minecraft-svg-images-free_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-premium-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-dinosaur-simulator-hack-script_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/get-free-robux-info_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-robux-for-no-money_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/hack-robux-cheat-engine-61_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/dragon-ball-advanced-battle-roblox-hack_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/commands-for-free-admin-for-roblox-list_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_off0000319c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x319C 22792 bytes
SHA-256: ae45dab093e4305e78de3aade26954ab486c9a35bbf4be424a475169db88ff9b
font_01_sfnt_off000064ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64AB 18004 bytes
SHA-256: 0f5586fad8963a3d66dcc08ea216a344d94ecc2f9eb49a7a48818ccd749a571f

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