Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f90ced3ba19410…

MALICIOUS

PDF

34.8 KB Created: 2021-07-06 03:00:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 18b70be3d6d165470254cec0196d1847 SHA-1: 2837d320f3780729d07aecda272624592f6c9a7f SHA-256: b3f90ced3ba19410d89c96356978864f08cf81a01ac54f3e690b392ab83b2f38
160 Risk Score

Malware Insights

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

This PDF document employs a lure related to game hacks and free in-game currency to trick users into clicking malicious links. The primary link directs to a known malicious redirector infrastructure, which likely serves to further obfuscate the final malicious destination or deliver a payload. The ML classifier strongly indicates maliciousness, and the presence of multiple links to similar lure-based PDFs reinforces the phishing and potential malware distribution intent.

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/how-to-get-hacks-on-roblox-game-hack In PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-robux-fast_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/get-free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-fan_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/freespinandcoin-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/boxland-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/robux-xyz_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-granny-money-cheat_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-gg-redeem-codes_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/tiktok-accounts-for-free_GM835599320.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/hack-dragon-ball-super-2-roblox_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-promo-codes-2021-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-chest-coin-master_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_002_off000030da.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30DA 22532 bytes
SHA-256: b0338ac568d69647856d18306ba0deb8ca82fe6c02a3a67b60a8d894b926de8f
font_01_sfnt_off00006312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6312 18924 bytes
SHA-256: 8cdc80fef149013af70ce1ea380cb26237808cf67cdf225847d5804ac9d16e08

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