Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff6f9b994947198…

MALICIOUS

PDF

34.6 KB Created: 2021-07-06 03:44:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 73842e95fa6d184e6a1c9fc8a6e8bfcd SHA-1: e5e05daa8d9323208bc81ae68ff3efcf23ce8dd4 SHA-256: 8ff6f9b9949471981fe8377d3adf6a280d67fc85c53e57763dca7d7b47bde5bd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector pointing to a 'game hack' lure. This suggests the document's primary purpose is to trick users into visiting a potentially harmful website. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the embedded URLs and the nature of the lure are sufficient indicators of malicious intent.

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/479516143/wurst-client-download-game-hack In PDF document text
    • http://elibrary.perludem.org//repository/free-robux-pin-codes_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-a-free-dominus-in-roblox-mobile_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/hacks-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-free-vip-in-bublegum-sim-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-cheat-engine-november-2021-download_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-free-robux-without-a-human-verification_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/arbx-club-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-mobile-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/goo-recording-for-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-free-vip-server_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-promo-codes-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-free-robux-kid-friendly_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-roblox-gift-ard-codes-valid-codes_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_off00002fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FCE 22832 bytes
SHA-256: 167afe66c41f90df25054b707176c3d273c015ab59dabbd9f8e80a3e4478f4ce
font_01_sfnt_off00006285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6285 18916 bytes
SHA-256: fe5b8b06ad39d3edbc090aa20693a1c8a054cb2710cc0055549efb945d801e77

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