Malicious PDF — malware analysis report

Static analysis result for SHA-256 68849e8b41a67849…

MALICIOUS

PDF

33.8 KB Created: 2021-07-03 18:26:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 31fe4291a5ac87ca4767a0b27391bf7f SHA-1: fb1a1d395ccb94056de822cf836b9230ec5ca111 SHA-256: 68849e8b41a678494a901d1d1e77d9526b29ad3888dc8bb24391cecf73fa1fe8
200 Risk Score

Malware Insights

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

The PDF document employs a fake CAPTCHA lure to deceive users into interacting with malicious content. It contains links to known malicious redirector infrastructure, specifically http://netcdn.tw/app/479516143/minecraft-ore-finder-mod-game-hack, which likely serves as a gateway to further malicious activity. The ML classifier strongly flagged this PDF as malicious, supporting the observed deceptive tactics.

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/479516143/minecraft-ore-finder-mod-game-hack In PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-website-robux_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/link-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/watch-videos-for-robux_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-hack-roblox-accounts-2021-december_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-get-free-hair-for-avatar-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-outfits-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/how-to-make-pants-in-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/hacking-mad-games-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-hack-no-verification-ios_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/noob-vs-pro-vs-hacker-vs-god-minecraft_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/www-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-outfit-from-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-hack-coin-master-apkmody_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/link-for-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/coin-master-free-2021-spin-link-today_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/freerobuxhack-us_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/minecraft-pocket-edition-free-download_GM479516143.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_off0000307b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x307B 22200 bytes
SHA-256: ec74f1613b878ad9e9a17b43509225c6c5c3122b2e5f819e4c4a8245d5477655
font_01_sfnt_off000061c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61C0 18172 bytes
SHA-256: cbfdbe6a03865e56b2a2599298d4250e861b0becc3aea606247bbe699f23854d

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