Malicious PDF — malware analysis report

Static analysis result for SHA-256 deebd8f3ec841837…

MALICIOUS

PDF

34.5 KB Created: 2021-07-08 00:38:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ac6f1b8cb5102fefbc5d75811ad54ed4 SHA-1: 6bc3689b170caca14c752e2735adf8a0fbed4cc3 SHA-256: deebd8f3ec841837e5472ab30978ee8aa558d4cacf3cc770cf82697196369e87
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that are flagged as malicious redirectors, specifically promoting 'Coin Master Hack' and 'Roblox' related content. The document body and embedded links directly point to URLs designed to lure users into downloading potentially unwanted software or visiting malicious sites. The ML classifier also strongly indicated maliciousness.

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/coin-master-hack-2021-download-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/inappropriate-roblox-games_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/spin-coin_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/como-hackear-coin-master-sin-verificacion-humana_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-free-animations-ninja_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-gold-cards-hack-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-hack-roblox-with-inspect-element-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-for-taylorkittylover1_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-ninja-legends-fan-groups-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/is-tiktok-free_GM835599320.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-cool-roblox-exploits_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/cheat-engine-roblox-mac_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_off00002ffd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FFD 22452 bytes
SHA-256: 270abebb647f08e7665471b12dce31989f8685929dfe1d8204838ee594cd0809
font_01_sfnt_off000061e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E0 18988 bytes
SHA-256: af951b1633a2787412a9a702c9754db5e3271a3175a3f5193121ef3c3d99dea6

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