Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c086ed17b6895dd…

MALICIOUS

PDF

34.5 KB Created: 2021-06-25 22:08:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 812d9f1fcfde9549ff1ecaca30280b47 SHA-1: 23fb90d7f1a095e66d90117044f7689f8da06bc1 SHA-256: 6c086ed17b6895ddf60fd94a3c1c27f15c6ae0e578f3e70040e7ab7f14af1fa0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as lures for game hacks and free in-game currency. The primary redirector URL is http://netcdn.co/app/431946152/roblox-how-to-make-a-free-admin-game-game-hack. The document body and embedded links strongly suggest a social engineering tactic to drive traffic to potentially malicious sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/roblox-how-to-make-a-free-admin-game-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/how-free-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-100-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/best-site-for-free-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/tiktok-free-video-download_GM835599320.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-mojang-account-with-minecraft_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spins-and-coins-group_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-minecraft-on-chromebook-for-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-windows-10-edition-hacks_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/toolbox-for-minecraft-ios_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spin-game_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-dat-boi-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-limiteds-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-pet-food-hack_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-roblox-gift-card-codes-2021-august_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_off00002f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F94 21840 bytes
SHA-256: be131fbc72e6f61ceffcf642ebaa2f10f4551580db4d77fdc53d44e3e40a0f9a
font_01_sfnt_off00005fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDA 19736 bytes
SHA-256: 944c41885ea5256734d26f4be751314e12a822e802285ffa8af9d26ba0ab65a4

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