Malicious PDF — malware analysis report

Static analysis result for SHA-256 9165c74ca9bf51d0…

MALICIOUS

PDF

47.3 KB Created: 2021-05-14 07:30:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d8a067f4b2120f7f00e0a4805433e952 SHA-1: a4377f945147d1423b3dece88955bbb755b165bb SHA-256: 9165c74ca9bf51d09b556f1089f8ab0ebcf27b21da8b5eefe5f47eba23b53d29
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites that are flagged as malicious redirectors, specifically advertising game hacks and free spins. The document body, though heavily obfuscated, contains references to these lures and the wkhtmltopdf tool, suggesting it was generated to present these links. The presence of these malicious links and the lure-based content strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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-hack-xyz-game-hack In PDF document text
    • https://beauty911.tw/upload/files/game-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://beauty911.tw/upload/files/coin-master-fb-free-spins-link_GM406889139.pdfIn PDF document text
    • https://beauty911.tw/upload/files/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • https://beauty911.tw/upload/files/coin-master-free-spins-cheat-codes_GM406889139.pdfIn PDF document text
    • https://beauty911.tw/upload/files/how-can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://beauty911.tw/upload/files/download-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://beauty911.tw/upload/files/coin-master-hack-2021-without-human-verification_GM406889139.pdfIn PDF document text
    • https://beauty911.tw/upload/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://beauty911.tw/upload/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://beauty911.tw/upload/files/coin-master-free-items_GM406889139.pdfIn PDF document text
    • https://beauty911.tw/upload/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://beauty911.tw/upload/files/free-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • https://beauty911.tw/upload/files/coin-master-daily-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • https://beauty911.tw/upload/files/coin-master-hack-version-download-2021-ios_GM406889139.pdfIn PDF document text
    • https://beauty911.tw/upload/files/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://beauty911.tw/upload/files/free-robux-net_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049cb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49CB 26152 bytes
SHA-256: 8d2d37b8bc78a647a2b495f2d2c081e12ee3432b2c837251b359a88ff2e0443f
font_01_sfnt_off00008468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8468 7332 bytes
SHA-256: d811e0aca85f3b94c42cd1240eec68b8eb378f3d8be5e408d3f6abd0f11f834d
font_02_sfnt_off00009680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9680 18204 bytes
SHA-256: eb378c11d4c3edf43fd4a317fe896922564aeaa66921672c4d59ab66e1a3bbf9