Malicious PDF — malware analysis report

Static analysis result for SHA-256 798a419b3b1e2223…

MALICIOUS

PDF

45.3 KB Created: 2021-06-07 00:22:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 517571858fdcfc9ea91be8d03d6cbef1 SHA-1: 367312d58cf7b6a5a63713005d572bb5a85710fe SHA-256: 798a419b3b1e22232bed595f0eb0a64610fdcb3927510c29eaa6a9752e499258
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for game hacks and redirects to known malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to trick users into visiting a malicious site, likely for credential harvesting or further malware delivery. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/join-roblox-players-game-hack-game-hack In PDF document text
    • http://library.unissula.ac.id/fe/repository/how-to-get-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/minecraft-java-code-free_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/get-free-spins-link-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/free-spin-gratis-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/minecraft-images-free_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-25-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/how-to-get-free-clothes-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-free-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-app-hacks_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/prison-life-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/reddit-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/is-coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/how-to-get-more-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/download-hacked-games-com-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/hacked-roblox-game_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
stream_004_off00004efc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EFC 26012 bytes
SHA-256: 529e9acaf806a51eb10dcddca7e9247e9e931b6263adbf11a080473cddaeb3d1
font_01_sfnt_off00008c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C11 19060 bytes
SHA-256: f75e1d7f6a6a30070654c0ae019f721256643d6cb31dbbc28ac629077374b1ab

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