Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b373e6ebf76a20…

MALICIOUS

PDF

40.9 KB Created: 2021-05-03 17:05:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ca5788468c950fe32e77c2d58fd2f8ea SHA-1: 8cbd21e96faad158e6b583223529b6981adc8f39 SHA-256: 99b373e6ebf76a206c968f57156de43aa9b56bf8f3f9f671976f90c9a1f1de83
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, one of which is identified as a malicious redirector for a game hack generator. The document body, though partially corrupted, suggests a lure for free game hacks. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 https://netcdn.xyz/app/431946152/download-roblox-for-free-unlockable-game-hack In PDF document text
    • https://lib.stie-yai.ac.id/repository/tdm-shirt-roblox-free.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-dragon-ball-z-final-stand-cheats.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/hacks-for-royal-high-roblox-2021.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-survive-the-disasters-cheats.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-dungeon-quest-hack-download.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-dex-explorer-hack.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/earn-your-free-rank-roblox.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/best-meliodas-roblox-face-free.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/cursed-roblox-outfits-free.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/red-roblox-shorts-free.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_003_off0000423f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x423F 24912 bytes
SHA-256: 3004d1bc59c5ae4572212faae9728f42691c2e43adea2270af745be04f04fa0f
font_01_sfnt_off00007bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD6 19036 bytes
SHA-256: 294c11122365e8b898b1dbb8be9fdd0bdeed1116460b51fba551df09f3aea259