Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0e4dd776d21528…

MALICIOUS

PDF

35.1 KB Created: 2021-06-19 15:10:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 3d637f0beafe6d09cfccb5088cc580a3 SHA-1: c71a4930f42e92236d837eff652cf85173fa9405 SHA-256: af0e4dd776d21528d2a42c58f02b13dc1bf4994a1462cfb5abf62f7a27ad74a8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, masquerading as generators for game items or accounts. The heuristic PDF_GAME_HACK_REDIRECT_LURE specifically flags these links as malicious. The document body and embedded URLs indicate a lure for free game-related content, likely to deceive users into visiting malicious sites.

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.co/app/431946152/free-rich-roblox-accounts-2021-game-hack In PDF document text
    • http://winnerwater.com.tw/image/data/files/coin-master-hack-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-op-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/minecraft-free-reddit_GM479516143.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/how-to-earn-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/fake-robux-codes_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/give-me-robux-now_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/roblox-pokemon-free-play_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-minecraft-for-kids_GM479516143.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-coins-and-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-coin-master-spins-2021_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_off000030dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30DC 22412 bytes
SHA-256: ae2ed6cd069188e22c4f4a02fcc3f14814749267a149fff21764e69892938cdf
font_01_sfnt_off00006281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6281 19580 bytes
SHA-256: b71bdb875f3f403c5bbbe0454dc774f569c848e935d4b4d01432046ac278e67a

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