Malicious PDF — malware analysis report

Static analysis result for SHA-256 383c7d3bc857c99a…

MALICIOUS

PDF

44.6 KB Created: 2021-06-03 23:48:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 31494bc18d442ce2f9d8210b08542421 SHA-1: 5c6a195fc6a8ec51316ecd0d1bc1170762947efc SHA-256: 383c7d3bc857c99aa1eda2e5d98505d56fff9e12637ff75dec6f84dc30f075d8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links, specifically targeting users with lures for game hacks and free currency. The embedded URL https://netcdn.online/app/431946152/earn-robux-sites-game-hack is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to drive users to potentially malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/earn-robux-sites-game-hack In PDF document text
    • http://library.stieyapan.ac.id/repository/robux-for-offers_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-roblox-executor_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/freespinandcoin_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-get-free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-hacks-ps4_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-girl-hair-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-download-pc-free_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/today-coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/hack-coin-master-game-apk-download_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/mcpe-client_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-tiktok-fans-and-likes_GM835599320.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/robux-sign_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-online-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/instant-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-robux-only-1-step_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_off00004e67.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E67 26336 bytes
SHA-256: 8f651dfe4c17023f58df273d4f9cf0f2a9dae4b0b14c3cf7aed963abdf35d2ca
font_01_sfnt_off00008b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B6B 18300 bytes
SHA-256: 9e3af24e52ef4cb9fc4b51a762cd65285bc4813e2d9c15cd1a5337b0fae4df73

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