Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c75948e0273c3fa…

MALICIOUS

PDF

40.6 KB Created: 2021-05-15 01:40:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f7131d6bf8a94cb14550141f97d998e9 SHA-1: fde50ca52ea7b06c2fdcc5c5135e361af5bcaac5 SHA-256: 2c75948e0273c3fa116538cdbd6217bc054b97c68a05d1ce11ff568103fa6b9c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including a known malicious redirector, disguised as generators for game currency. The heuristic firings indicate that these links are intended to lure users to malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious download or phishing page, likely leveraging a PDF vulnerability or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/coin-master-spin-free-game-hack In PDF document text
    • http://mbbs.hr/files/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-roblox-girl-clothes_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-hack-version-download-2021-ios_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-game-android-free-download_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-minecraft-generator_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/robux-boost_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/best-site-for-free-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/hack-coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-minecraft-for-kids_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/getrobux-come_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_003_off0000479d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x479D 23884 bytes
SHA-256: 185406dbc8b25a27932c8b7107a2d950fc57035c012d667574104b4fb0d2bc43
font_01_sfnt_off00007d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D91 17884 bytes
SHA-256: f64f8d8cd546afe107dcd88d9ce91258665e3d619825ef5ba403a2abc0c27184

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