Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8e20fd371336f8…

MALICIOUS

PDF

33.4 KB Created: 2021-07-04 13:32:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 142dc4322a8966e99db93ac7b9b5c750 SHA-1: 29d30706bd92e30ead46eb1eecae35f732cb9a8c SHA-256: 1f8e20fd371336f874ea45cd2340d078470cc719bddd1740ee64993707ae13bb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, disguised as generators for popular games like Minecraft and Roblox. The document body and embedded URLs strongly suggest a lure for users seeking cheats or in-game currency, which is a common tactic for distributing malware or conducting phishing. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of a malicious payload being delivered.

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/free-minecraft-account-generator-game-hack In PDF document text
    • https://encounternepal.com/userfiles/files/hack-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-free-apk-download-016-0_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-website-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-hacks-115-2_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-game-free-spin-download_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-spin-online-tool-coin-master_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-hack-tool-no-survey_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/www-free-robux-com_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-coins_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/is-minecraft-free_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-book-collection_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-hack-to-get-robux_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_off000030c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30C9 21676 bytes
SHA-256: 72b5878492e14c302de5ca0fad725b400ecfc9f35785f22e35d0895cffaba7a5
font_01_sfnt_off00006056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6056 18140 bytes
SHA-256: 96e262c6d53304f841c0c810fa761a1b3e3647c443a06172135a50457bf60c04

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