Malicious PDF — malware analysis report

Static analysis result for SHA-256 06deac3a80227e5d…

MALICIOUS

PDF

44.2 KB Created: 2021-06-03 23:25:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 79cee7e57557c607449431cc9603f65e SHA-1: 3a440b51acad36be3c3303ac114c2a07760e9dbc SHA-256: 06deac3a80227e5d5ed7efc9a89cdc376a4e584ca45be9fb137678359962e728
200 Risk Score

Malware Insights

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

The PDF document employs a fake CAPTCHA or human verification prompt to trick users into clicking malicious links. These links, such as 'https://netcdn.online/app/431946152/apps-for-free-robux-game-hack', lead to known malicious redirector infrastructure. The document's content and embedded URLs suggest a lure for game-related cheats or generators, a common tactic for distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/431946152/apps-for-free-robux-game-hack In PDF document text
    • http://library.ulb.ac.id//repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-blogspot_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/tiktok-free-50-likes_GM835599320.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/earn-rbx_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-minecraft-mods-for-pc_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-shields-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/roblox-trolling_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-pet-treats-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/cute-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/aimbot-exe-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/minecraft-creative-mode-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-modded-minecraft-server_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-level-3_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_off00005153.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5153 24924 bytes
SHA-256: a24b3cf57fd31f7cfa993de7d5f756f0af59b2fcab01600ecb713ab8d1476404
font_01_sfnt_off00008a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A9D 18192 bytes
SHA-256: b6bed13222f637b3eaa93fd3412fcfb5f097d091c9d6b8306e759aa57a7fe68b

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