Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ce69582fcf46ff…

MALICIOUS

PDF

35.2 KB Created: 2021-07-05 00:55:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0b9fb5f3d72640defacb29e73eaf5cf3 SHA-1: 1405631bb2e4e1a81aa2ea85d7e03b94442e54c6 SHA-256: a9ce69582fcf46ff77989d9a4361992b9c5ca6abc5fdc1129b83d078504d0bc2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector domains, specifically advertising 'game hacks' and 'free currency' for popular games. The primary redirector URL, http://netcdn.tw/app/406889139/coin-master-hack-8-ball-pool-game-hack, is flagged as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering lure designed to lead users to potentially malicious websites.

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/406889139/coin-master-hack-8-ball-pool-game-hack In PDF document text
    • https://encounternepal.com/userfiles/files/free-roblox-hair-to-wear_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-win-10-free_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-girl-hair-free_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-spins-and-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-hack-online-without-human-verification_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-do-i-get-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-coins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-jump-hack-in-roblox_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/cute-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-promo-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-a-free-lamborghini-in-roblox_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-hack-com_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-spins--coins-2021_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-coin-master-links_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-your-hacked-roblox-account-back-2021_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-free-robux-instantly_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_off000031dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31DD 23200 bytes
SHA-256: 1edb08291cf615bc32ef6b3bbfab954152385477ebcd1b8fe24e701ca7add219
font_01_sfnt_off0000660d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x660D 18656 bytes
SHA-256: 9cc3a0a753a325654d75dca011d50bcc08942e96fa930538f944fba4de9b9fc3

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