Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9efa6f04b6a5fe…

MALICIOUS

PDF

34.9 KB Created: 2021-07-06 14:04:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 72aac3c3becdd6dbe13a98864c5f3ab3 SHA-1: 2ce47bcea5ed85ea101fdb0f479e39ef0dd9f9b6 SHA-256: 1d9efa6f04b6a5fe6ce35177a9bc690db0924d3ebf7cc0fd1c2d3639227ad65a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirector lure, pointing to malicious infrastructure. The document body, though heavily obfuscated, contains URLs that align with this finding. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves tricking users into visiting a malicious URL under the guise of obtaining game cheats.

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/431946152/roblox-rules-game-hack In PDF document text
    • http://elibrary.fl.unud.ac.id/repository/how-to-hack-on-cbro-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/roblox-20210-robux-free_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/vehicle-speed-with-cheat-engine-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/cheat-engine-cheats-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-games-download-free_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/hack-my-game-xyz-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/btool-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/hack-2021-roblox-ap_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/cool-free-roblox-hats_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/hack-resoure-for-roblox-bgabag_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/best-free-items-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/robux-hack-free-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/windows-10-minecraft-free-with-java_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/how-many-levels-are-in-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/earn-robux-sites_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/roblox-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/secret-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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_off00003297.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3297 22524 bytes
SHA-256: 0f2673530d450a0dc44273c566d19b1992c7738f248949e93b00071a0e9718a8
font_01_sfnt_off000064ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64BA 18628 bytes
SHA-256: 0af2336bfb8ad654c70bce51cc422f7999ba41cc76446f2b895758c4807c71c1

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