Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93616fceac7fdb9…

MALICIOUS

PDF

33.8 KB Created: 2021-07-05 15:21:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f7492c0249da4651e40f15dc3385ceb7 SHA-1: bc4ec5fff3e8e377c7a964b5e546451e3a93c200 SHA-256: c93616fceac7fdb9a40c751f5e0d693834b2c16f7a5d15975fbbad577bcefe5d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting 'free generators' and 'game hacks' for popular games. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it links to known malicious redirectors. While no scripts were explicitly extracted, the nature of the lure and the embedded URLs suggest an attempt to drive users to a site that likely hosts further malicious content or exploits.

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/free-roblox-toys-game-hack In PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/minecraft-pe-hacks-ios_GM479516143.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/hackeando-en-roblox_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-mod-apk-latest-version-free-download_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-2021-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-to-hack-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/hack-roblox-bee-swarm-simulator-apk_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/minecraft-games-online-free-no-download_GM479516143.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/robux-fun-hack_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/facebook-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/hack-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-to-change-your-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/body-roblox_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/roblox-hacks-com_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/roblox-treelands-hack_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/hack-de-roblox_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/best-free-stuff-in-roblox_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_off00002f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F1D 21904 bytes
SHA-256: 16b2111a374abbf886b8920703ec3fdc59801855dfb3244ec3bc5825e2c9caf8
font_01_sfnt_off00005f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F63 18828 bytes
SHA-256: 0ae16075fab88340abf3ae58f1c231bf26e12fe3956ddb751496fa7b825c2438

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