Malicious PDF — malware analysis report

Static analysis result for SHA-256 f042911c1d7b962d…

MALICIOUS

PDF

34.2 KB Created: 2021-07-03 11:16:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2f10ae5bd8474b86cf0b1becda8fdcbc SHA-1: 4674fc9ca6c4c43a6afee06cf99a8b97e6640fc2 SHA-256: f042911c1d7b962dee3319dd29a971fa41885ae463a1abfe2584626bdb4663ad
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites that offer game hacks and cheats, including a primary link to 'download-coin-master-hack-tool-v1-9-game-hack'. This indicates a lure-based attack pattern designed to trick users into downloading potentially malicious files. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector infrastructure being used.

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/download-coin-master-hack-tool-v1-9-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-cheats-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/i-didnt-get-my-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-tower-defense-2-hacked_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/robux-cheat_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-cheat-in-roblox-rpgs_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-piano-monody-hack-delay_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/cerberus-free-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-lua-script-gear-giver-hack_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-hack-a-minecraft-account_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-jailbreak-free-money-codes_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-limited-offer-game-answers_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-hacking-computer-games_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-cards_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_off00003044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3044 21840 bytes
SHA-256: 7c8d3bef92895a5e89ac8a3b7523e4db610c533ab3dba2ba191a1d1bca962d21
font_01_sfnt_off00006072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6072 18988 bytes
SHA-256: d690daf4a72672f829000763fc4259cf15b2945cba964cb3cfe081013f67300a

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