Malicious PDF — malware analysis report

Static analysis result for SHA-256 84137b2d9e217a1a…

MALICIOUS

PDF

46.1 KB Created: 2021-06-03 09:12:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9f0caa334bb8403683d84a77acf0cb08 SHA-1: 77be213b31400b43ce880c637c54268117a09d48 SHA-256: 84137b2d9e217a1a9676205be94cacfdaeeac46ba8f49ecca1b941b798beb73d
160 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and a heuristic firing for an external URI, all pointing to sites offering game hacks. The presence of a 'download button' heuristic further suggests a social engineering attempt to trick the user into downloading a payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.online/app/431946152/mobihack-net-roblox-hack-game-hack In PDF document text
    • https://goodtools.tw/upload/files/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/tiktok-freein_GM835599320.pdfIn PDF document text
    • https://goodtools.tw/upload/files/tiktok-free-palestine_GM835599320.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/minecraft-pocket-edition-free-ios_GM479516143.pdfIn PDF document text
    • https://goodtools.tw/upload/files/robux-free-online_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/hack-minecraft_GM479516143.pdfIn PDF document text
    • https://goodtools.tw/upload/files/hack-master-coin-pc_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-hair-for-free_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-free-spins-link-2021-app_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-free-spins-ios_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-free-pants_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/robloxfun-com-generator_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/is-roblox-free-on-ps4_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-free-spins-twitter_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
stream_004_off000052aa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52AA 26456 bytes
SHA-256: 81a08b6c5f510dcbc3b76fca0240b1a08a2a60ed5b89d05e2cba0238e03ab868
font_01_sfnt_off00009074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9074 18768 bytes
SHA-256: 4038ce5e3e0945c6cd976405ec29b4e5783f739c83bcd68413f286c6b350b233

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