Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c1b8c09d0624a0…

MALICIOUS

PDF

34.6 KB Created: 2021-07-04 11:32:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5e48f5909f80a20073b989512d94996b SHA-1: bb9c7ee586e11ded20c6532a2fadb7b503cb3e8d SHA-256: d0c1b8c09d0624a0c764f9026a103dd9ce954433579e70a916e186490eabfd04
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically advertising 'free generators' and 'game hacks' for popular games. The primary redirector URL, http://netcdn.tw/app/406889139/free-spin-coin-master-apk-game-hack, is flagged as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt, likely using a spearphishing attachment vector.

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/free-spin-coin-master-apk-game-hack In PDF document text
    • http://slim.sisminkada.net/repository/promo-codes-for-free-stuff-roblox_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-freebies-2021_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-daily-free-spins-link-today-blog_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-highschool-money-hack-cheat-engine_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-glitch_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-kick-off-hack-download_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/minecraft-for-free-apk_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-cheat-codes-for-pc_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-phantom-forces-aimbot-mod-download-free-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coinmasterdailyfreespins-com_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/hack-roblox-sin-virus_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/make-free-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-tiktok-fans-and-likes_GM835599320.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/gun-hacks-for-roblox_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/can-you-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/comandos-de-hacks-para-roblox_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
stream_002_off000031dc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31DC 22580 bytes
SHA-256: a717b75a2ffa80fa3a75d7c21986acc6c8c26b4588095dcfdf82a388b719cccb
font_01_sfnt_off00006446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6446 18344 bytes
SHA-256: 7d9887165ef16feadfba3a4a15f66fbc2523fe3814b25ea6526ef71165c50439

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