Malicious PDF — malware analysis report

Static analysis result for SHA-256 485704f21572e8d6…

MALICIOUS

PDF

47.1 KB Created: 2021-06-04 00:33:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e3ea323fd8a5d4f81b8eccd09bf5383b SHA-1: 754229074cecff307e03783b404bd08417cb401d SHA-256: 485704f21572e8d6067688fef5f617268caebd7cc97ab917377b9c652d55a1e5
200 Risk Score

Malware Insights

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

The PDF document employs a fake CAPTCHA lure to trick users into clicking a link, which leads to a known malicious redirector. The primary link, https://netcdn.online/app/406889139/hack-coin-master-apk-ios-game-hack, is designed to download further malicious content. The document's structure and embedded links strongly suggest a phishing or social engineering attack aimed at delivering a payload.

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.online/app/406889139/hack-coin-master-apk-ios-game-hack In PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-viking-quest-hack_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-game-pack-with-google-play-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/pubg-uc-price-in-nepal_GM1330123889.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-hack-client_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/minecraft-114-download_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/all-minecraft-handbooks_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-coins_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/is-minecraft-free_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-free-spins-link-2021-blogger_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-get-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-link_GM431946152.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_off000051b2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51B2 26316 bytes
SHA-256: 73fa675aedfa594078a7163878c941ec6bd0c7eb8109b0662e3b992bc2de39b0
font_01_sfnt_off00008caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CAF 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off00009662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9662 17892 bytes
SHA-256: db4cb0e5038e40aae5db0274b23e1c53a74243cd1ac5b16be32cf562ede0c44a

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