Malicious PDF — malware analysis report

Static analysis result for SHA-256 851537d6aa64cace…

MALICIOUS

PDF

34.4 KB Created: 2021-07-07 14:26:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b98fde67bfb0c62f665c3ca5bcc0e5a5 SHA-1: aacceedfebe7694bbe5c59299d1f5387cebce190 SHA-256: 851537d6aa64caceed0f154e27d7b041c8cca8a2ab3e4c4ce046b66fd0e33e67
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors and game hack lures, such as 'how-to-hack-roblox-to-get-free-robux-game-hack'. The document body and embedded URLs are designed to trick users into clicking through to potentially malicious websites. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links.

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/431946152/how-to-hack-roblox-to-get-free-robux-game-hack In PDF document text
    • http://www.elearning.mysadam.info/__statics/gudangsoal/files/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elearning.mysadam.info/__statics/gudangsoal/files/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://www.elearning.mysadam.info/__statics/gudangsoal/files/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://elearning.mysadam.info/__statics/gudangsoal/files/coin-master-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://www.elearning.mysadam.info/__statics/gudangsoal/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://elearning.mysadam.info/__statics/gudangsoal/files/tiktok-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://www.elearning.mysadam.info/__statics/gudangsoal/files/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • http://elearning.mysadam.info/__statics/gudangsoal/files/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://www.elearning.mysadam.info/__statics/gudangsoal/files/free-tiktok-followers-generator_GM835599320.pdfIn PDF document text
    • http://elearning.mysadam.info/__statics/gudangsoal/files/how-to-cheat-on-roblox-giant-dance-off_GM431946152.pdfIn PDF document text
    • http://elearning.mysadam.info/__statics/gudangsoal/files/free-spins-october-28-2021-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.mysadam.info/__statics/gudangsoal/files/coin-master-spins-gratis_GM406889139.pdfIn PDF document text
    • http://www.elearning.mysadam.info/__statics/gudangsoal/files/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://www.elearning.mysadam.info/__statics/gudangsoal/files/comment-avoir-un-dominus-aureus-free-ssur-roblox_GM431946152.pdfIn PDF document text
    • http://www.elearning.mysadam.info/__statics/gudangsoal/files/coin-master-game-hacks_GM406889139.pdfIn PDF document text
    • http://www.elearning.mysadam.info/__statics/gudangsoal/files/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.elearning.mysadam.info/__statics/gudangsoal/files/how-to-get-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://elearning.mysadam.info/__statics/gudangsoal/files/free-roblox-svg_GM431946152.pdfIn PDF document text
    • http://elearning.mysadam.info/__statics/gudangsoal/files/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.elearning.mysadam.info/__statics/gudangsoal/files/free-robux-that-actually-works-2021_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_off00003081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3081 22012 bytes
SHA-256: cdadb78171683d27b5ba7938032c1b2fc01433b520a7110f28c5a5aeed6a4391
font_01_sfnt_off000060e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60E5 19228 bytes
SHA-256: bcb228600d1876164d47ff19adbc225d1b3379d908d021e666a2e799a71a81d1

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