Malicious PDF — malware analysis report

Static analysis result for SHA-256 37667cc069c0bf21…

MALICIOUS

PDF

46.3 KB Created: 2021-05-16 01:48:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ed26c58a416553475fbfedd0928fcd80 SHA-1: 1000250e54964e38470cb6d9af35d2d7e4c41a73 SHA-256: 37667cc069c0bf215c64197d4cca71c05b42bd023e68a0727d94c46392e0d545
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The document contains multiple links to known malicious redirectors and lures users with a fake CAPTCHA prompt. The primary malicious URL identified is https://netcdn.xyz/app/431946152/free-generator-game-hack, which is likely used to deliver a secondary payload or lead users to a scam. The presence of a fake CAPTCHA suggests an attempt to trick the user into interacting with the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8696

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.xyz/app/431946152/free-generator-game-hack In PDF document text
    • http://library.unissula.ac.id/fe/repository/static-moonactive-net-rewards_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-attacks-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-daily-link_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/how-to-sue-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/give-me-robux-now_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/hack-coin-master-link_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/free-spins-and-coins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/coin-master-hacks-iphone_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/haktuts-2021-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-minecraft-premium-account_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/minecraft-beta-free_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/minecraft-free-download-mac-full-version-2021_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_003_off00004a99.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A99 26060 bytes
SHA-256: 972ff81a9460e3f0c1d65c1da0826658caba9e144120dafe504bbd04678fd5f6
font_01_sfnt_off0000875a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x875A 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off00009401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9401 17840 bytes
SHA-256: 3a905730409273d870ff573b7baf28e8fde68c17f4b305340d785871e619a609

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