Malicious PDF — malware analysis report

Static analysis result for SHA-256 5524ed0819f936b6…

MALICIOUS

PDF

34.5 KB Created: 2021-07-06 04:36:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1c06114c4af47f814d4546958b1d0853 SHA-1: 5766665a1c09dc7fed4613eebdf127cadd97fe31 SHA-256: 5524ed0819f936b6053e28a839e1c26e2473f2b3a38957b1ba3c9c42f25fd2a1
160 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a game hack redirect lure, pointing to malicious infrastructure. The document body and embedded URLs reinforce this, indicating a social engineering attempt to trick users into visiting a potentially harmful site. The ML classifier also strongly flagged this PDF as malicious.

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-heaven-free-spins-and-coins-game-hack In PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-game-hack-kaise-kare_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/is-minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-roblox-to-play-without-downloading_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/cheat-power-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/how-are-people-able-to-cheat-in-items-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/minecraft-pe-hack-client-ios_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/mod-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-inappropriate-games_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/free-modded-minecraft-server_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-free-vip-for-all-places_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-tiktok-views-trial_GM835599320.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/cheat-engine-fly-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-hack-roblox-to-where-you-can-fly_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-free-codes_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-free-coins-and-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
stream_002_off00003134.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3134 22600 bytes
SHA-256: c1fa3117a545051d99d02574597dea5beabac23970bff5ff56a0212e63b841b5
font_01_sfnt_off00006393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6393 18464 bytes
SHA-256: e29d487d5de7035ee5fac4d1170ad20c2d1179db1b05291707a01d315daf5a38

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