Malicious PDF — malware analysis report

Static analysis result for SHA-256 3daa0e75a747c6bb…

MALICIOUS

PDF

35.0 KB Created: 2021-07-04 22:43:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4202ce376a98cf6134f0c768ab84d983 SHA-1: 025651dbb2325c802fae3c6b3463d6ccfc717151 SHA-256: 3daa0e75a747c6bb92def74a1de7117b5377c265a43868da65bb0b746474ebab
180 Risk Score

Malware Insights

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

The PDF contains a lure for free game currency and hacks, directing users to a known malicious redirector. The document body and embedded URLs reinforce this theme. The malformed stream length suggests an attempt to hide malicious content, likely an exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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-codes-2021-not-used-game-hack In PDF document text
    • http://lib.stie-aub.ac.id/repository/can-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-r-cheats-2021_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-hack-roblox-big-brother_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-games-with-free-boombox-2021_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-free-robux-2021-on-phone_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/freegames911com-coinmastertipsandcheats2021freecoinsandspins_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-hack-killer-queen_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/woman-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/speed-hack-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/is-there-a-free-version-of-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/passengers-in-free-roam-in-flight-simulator-roblox-wiki_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-spins-for-free_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/this-game-has-shut-down-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-hack-penis_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-free-tickets-bee-swar-sim-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
font_00_sfnt_off00002fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FE5 22652 bytes
SHA-256: 1496eb1181ead49ebb296a43c6d8eb68a018bb3580818cab1e6aa704a69e5b46
font_01_sfnt_off0000628d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x628D 19396 bytes
SHA-256: 25d7bfe460846437b60ba32f00233ff0583bbe4639522c561b722c1edc24abf6

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