Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d6bda8dbb5518c…

MALICIOUS

PDF

44.6 KB Created: 2021-06-03 09:35:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 74b6c5bd4dc29a57485bf6aa6c20356f SHA-1: 7b62db8519242e661df377d4631c5e42f6ff0813 SHA-256: c3d6bda8dbb5518cc11f0031f3fd405d1ef37084e07a3af84ba2df3be48059b1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically advertising 'free generators' and 'game hacks' for popular games. The primary redirect URL is https://netcdn.online/app/431946152/body-roblox-game-hack, which is associated with a lure to download potentially unwanted or malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or social engineering attack aimed at tricking users into visiting malicious sites.

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/body-roblox-game-hack In PDF document text
    • http://library.gkigadingserpong.org/repository/minecraft-free-school_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/best-free-spins-link-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/pig-master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/minecraft-free-download-ipad_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-coin-master-account_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-spins-app-android_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-lawsuit_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-hack-spins-game-download_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-add-mods-to-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • https://www.bandicam.comIn 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_off00005212.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5212 25016 bytes
SHA-256: 7846149b314d2ee65b7af44c451c78c7672bd41aad8a93c377258d8946ab87a9
font_01_sfnt_off00008c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C1A 18140 bytes
SHA-256: 5c429d7d14e112022b2be879a8be260656d3ec767f5300b052428d03df27e3b3

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