Malicious PDF — malware analysis report

Static analysis result for SHA-256 825e6831ffbe0c79…

MALICIOUS

PDF

35.5 KB Created: 2021-07-05 09:13:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 07bd9bc90aae99dfe8371c42a341b6e1 SHA-1: 38e66cad8b580e94d6180127a280bde2f2b5d553 SHA-256: 825e6831ffbe0c79f4a3846b6e6d719eae9441ca87e35d03be1d95f46e7d325e
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including one to a known malicious redirector at http://netcdn.tw/app/479516143/good-free-minecraft-server-hosting-game-hack. The document body and heuristics indicate a lure for game-related cheats or generators, a common tactic for phishing or malware distribution. The presence of a visual download button further supports a malicious workflow designed to trick users into clicking through to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/good-free-minecraft-server-hosting-game-hack In PDF document text
    • http://wwic.wales/uploads/files/files/roblox-free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/robux-free-co_GM431946152.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/free-roblox-gift-card-codes-2021-unused_GM431946152.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/speed-hack-roblox-with-nopde-engine_GM431946152.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/how-to-get-free-robux-2021-easy-no-download_GM431946152.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/how-to-be-carrot-god-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/free-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/ninja-ide-free-roblox_GM431946152.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/ban-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/free-roblox-de_GM431946152.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/robux-hack-2021-on-phone_GM431946152.pdfIn PDF document text
    • http://wwic.wales/uploads/files/files/coin-master-free-spins-and-coins-haktuts_GM406889139.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_off0000359e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x359E 22652 bytes
SHA-256: 84c5a16e54a5f9974f462101cf6c718d3f24b60847a052af1aae458eda9d3df5
font_01_sfnt_off00006842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6842 18284 bytes
SHA-256: 7289302ae6250539789b9217bcc68894f0328a970bf5d67cc3f1b282cc8d95f9

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