Malicious PDF — malware analysis report

Static analysis result for SHA-256 457c7764cb83ff45…

MALICIOUS

PDF

34.4 KB Created: 2021-07-06 16:24:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2040d19785f1ba68b0d41bd24b544d0b SHA-1: 566217e64b502b69f3a312128d076421a16aa85c SHA-256: 457c7764cb83ff45212ba02a5d5dc401e7a61820d541e71e0a694d938ad64863
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to malicious infrastructure. The document body, though partially corrupted, contains text related to 'Coin Master Hack 2021' and the malicious URL. The presence of embedded URLs and the ML classifier's high confidence further support the malicious nature of this document, likely intended to lead users to a phishing or malware download site.

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-hack-2021-game-hack In PDF document text
    • https://library.elkatarie.ac.id/repository/vehicle-stereo-free-roblox_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/roblox-hacker-cods-fr-redline_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/full-server-hack-roblox_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/get-free-roblox_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/roblox-dashing-simulator-hack-script-2021_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/roblox-cheat-codes-no-phone_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/how-to-make-a-roblox-hack-with-lua_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/free-roblox-dev-to-hire_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/roblox-hack-download-pc-free_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/how-to-hack-bedwars-2-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/play-games-for-robux_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/minecraft-free-install_GM479516143.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/logo-roblox-cafe-gfx-free_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/emergecny-response-roblox-hack_GM431946152.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_off0000310e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x310E 22504 bytes
SHA-256: 70ea21ecc14a3449efabf9538b3d4cbbb7abdcd3b1cb7014e772843a9f3590bd
font_01_sfnt_off00006352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6352 18408 bytes
SHA-256: 8438728008f6ab05b5c9a65d4eeb1f2e5c23a436eadc11c6e76328f72b7d7fb7

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