Malicious PDF — malware analysis report

Static analysis result for SHA-256 644ecf75e370685d…

MALICIOUS

PDF

31.8 KB Created: 2021-07-06 02:28:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c675f0f8834d7c6e13a39b6ff61a8466 SHA-1: 6615ecb0fa642cc48a422d73f31ba840a0b723ef SHA-256: 644ecf75e370685dc8f760309bff688d6784cb631770ec01b7dd5bf274d73004
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and game hack lures, indicating a phishing or scam attempt. The document body explicitly mentions 'Coin Master Free Coins App' and 'CLICK HERE TO ACCESS COIN MASTER GENERATOR', reinforcing the lure. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 4

  • 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.
  • 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/406889139/coin-master-free-coins-app-game-hack In PDF document text
    • http://lib.mbp.ac.id/repository/how-to-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/freerobuxyz_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/hacker-banned-me-from-games-roblox_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/free-minecraft-gift-codes_GM479516143.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/roblox-premium-free_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/coin-master-ios-hack-download_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/roblox-download-ios-free_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/no-gravity-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/coin-master-free-coins-and-spins-link-today_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/coin-master-3533-android-hack_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/how-to-put-hack-script-to-roblox-parkour_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/counter-blox-roblox-offensive-knife-hack_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/coin-master-links-for-free-spins_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
font_00_sfnt_off00002992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2992 22008 bytes
SHA-256: c9d935eb8aa85915e10cd50c5221ff84e8d335fda18c97a72d866f557dc6553b
font_01_sfnt_off00005a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A38 18176 bytes
SHA-256: 78fd92e643045a663d15c45c74126e1d779604aea3e1437bd5d883e9616c0973

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