Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c64db6fb5723e3…

MALICIOUS

PDF

35.2 KB Created: 2021-07-06 07:36:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 84cc8e0c10148437505bc10acc9825eb SHA-1: 620020c6ade50ac41fd79f72c7aae38097f4fc72 SHA-256: 40c64db6fb5723e35c8a46b8648cd01beb32f9e3ceb812c0e9bb97390e7c836c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a malicious redirector, specifically targeting users with lures for game hacks and free Robux. The embedded URL 'http://netcdn.tw/app/431946152/how-do-u-get-free-robux-game-hack' is identified as malicious infrastructure. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or scam attempt designed to redirect users to potentially harmful content.

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/how-do-u-get-free-robux-game-hack In PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/robux-prices_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-run-4-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/bloxwin-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-links-for-free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/client-cheat-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-free-spins-cheats_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/minecraft-survival-hacks_GM479516143.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/roblox-cheat-apk-mod_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/roblox-hackings-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-free-spin-no-offers_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/flee-the-facility-roblox-hack-exploit-gui_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/minecraft-mobile-free_GM479516143.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/mcpe-client_GM479516143.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/roblox-its-free-roblox-id_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/how-can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-roblox-generator-for-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/minecraft-hack-client-18-9_GM479516143.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_off000031a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31A4 22552 bytes
SHA-256: d4aadc0ea94ecf015b567ddfabdc88962a6372ea79d5bed667ec293bfc55bf3e
font_01_sfnt_off00006421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6421 19152 bytes
SHA-256: e62fd154b22e8a237d0c5fd5aca87f51fb4a817c5318a30dd1d6bc44dc361d61

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