Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb141f888c452a57…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 12:04:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 96289c5a096b48cc370bec3cea821d95 SHA-1: 1b00d6ac7b6d454fc758bf4a1cfca94b465b2d45 SHA-256: cb141f888c452a578f9df5a1d40aa374c19b1b9fc6b48ad175ab433e50f9f520
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains multiple embedded URLs that lead to redirectors, specifically advertising 'Coin Master Free Spins Haktuts' and other game-related hacks. The heuristic firings confirm these links point to known malicious redirector infrastructure. While no scripts were explicitly extracted, the nature of the lures and the presence of embedded URLs strongly suggest an intent to redirect the user to a site that will either phish for credentials or exploit vulnerabilities for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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-spins-haktuts-game-hack In PDF document text
    • http://library.unissula.ac.id/fk/repository/rewardrobux-com_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/exploiteur-de-hack-roblox-lumber-tycoon-2_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/is-roblox-free-on-ps4_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-working-hack_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/how-to-get-free-gamepasses-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-free-spins-link-without-human-verification_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-free-spins-link-quora_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/buy-hacked-roblox-account_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/how-do-you-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/cheat-roblox-counter-blox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-free-coins-and-spins-link-today_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-hack-kill_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-get-a-shirt-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/inappropriate-roblox-games-2021_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/minecraft-free-download-mac-full-version_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-roblox-supreme-pants_GM431946152.pdfIn PDF document text
    • https://www.urcouponsdeal.com/2019/03/coin-master-free-spin-and-coin-links.htmlIn 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_002_off00003041.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3041 23496 bytes
SHA-256: 70b496480b597ca553effb8702a29a4dd5815dc326fc46fd9cc1dcf55dc7a7d3
font_01_sfnt_off0000658e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x658E 18484 bytes
SHA-256: f4f9ad1f9ed7968e2344e2d1f3b165ae8c607e70d6a002aee90d609eb2aca606

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