Malicious PDF — malware analysis report

Static analysis result for SHA-256 310d78ca822de49c…

MALICIOUS

PDF

45.8 KB Created: 2021-06-04 04:14:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d03ba3079eaed838a92bd89da649a55d SHA-1: c7eb9eca84013e39e48c38e50b52c40355186e84 SHA-256: 310d78ca822de49c6516ecfef59ec2e0b081a3469ebb28d6d10a15d54d4ab51c
200 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into clicking a malicious link, specifically advertising a 'Coin Master Free Coins and Spins' generator. The primary malicious URL identified is https://netcdn.online/app/406889139/coin-master-free-coins-and-spins-blogspot-game-hack. The document's structure and embedded links suggest an attempt to drive users to potentially malicious content or further downloads, aligning with common phishing and social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/406889139/coin-master-free-coins-and-spins-blogspot-game-hack In PDF document text
    • http://opac.stiesa.ac.id/repository/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/claim-roblox_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/minecraft-free-download-android_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-hack-unlimited-spins-apk-download_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/freegames911com-coinmastertipsandcheats2021freecoinsandspins_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-free-spins-instagram_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/gold-card-coin-master-free_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-to-hack-coin-master-game_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/doctor-louie-roblox_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/can-i-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-free-stuff_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_off000050a9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50A9 28664 bytes
SHA-256: 051abd242a267100cf2e9f520897123bdde4b9c11b3e09a68ffbefb0e4a1d838
font_01_sfnt_off00008f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F71 18636 bytes
SHA-256: 88ae2d3fcbda70c0dfe18bfa3c12f6e9cf10d469e04612efd9d0bb36059ec53b

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