Malicious PDF — malware analysis report

Static analysis result for SHA-256 3151a243f1ddbebe…

MALICIOUS

PDF

47.2 KB Created: 2021-06-11 11:59:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: a5fd0f10537715f374bbfc8a934c7400 SHA-1: 6c1e787dfe59efb187b05980440e9ed6df8f1b12 SHA-256: 3151a243f1ddbebe639ba8adfa0c896fcdd13d982e8f1e44b8f30e8b3122b1c5
200 Risk Score

Malware Insights

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

The PDF document presents a fake CAPTCHA or human verification prompt to lure the user into clicking a link. This link redirects to a malicious website that offers game hacks, which is a common social engineering tactic. The ML classifier also flagged this PDF with high confidence, indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.tw/app/431946152/free-manquin-roblox-game-hack In PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-hack-spins-android_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-free-spins-a2z-help_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-roblox-passwords-with-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-free-100-spin_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/get-free-spins-coin-master-october-2021_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-spins-and-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-coin-master-free-spins-in-email_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/can-you-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-robux-in-alternate-route_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/appsmobinfo-coinmasterhack-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/minecraft-xbox-360-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000516a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x516A 24416 bytes
SHA-256: 2c7ad99ad2dacc1be2e258d82ea26bbd79cceb818f0107551a922a1601147bff
font_01_sfnt_off00008986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8986 3032 bytes
SHA-256: a678a59ea5e0121232ef5eb391cf12ef11e3e9a06d1d48993572d767cb6716ed
font_02_sfnt_off00009408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9408 18804 bytes
SHA-256: a7eac8f1c449bea858f55b5f9b1f02ce15c00aaa7e0316ea2df49e25989b5c61

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