Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b46db39f3ab3cf4…

MALICIOUS

PDF

35.4 KB Created: 2021-07-02 03:08:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 55a87cf053937998b4e2f0164702ad60 SHA-1: decaf9f9975acef423841154aef2282da381f507 SHA-256: 8b46db39f3ab3cf4ef1a1d43d034b98bf9c20fbe3d1dbe14e6be58643889c360
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to what appears to be a malicious redirector, disguised as a lure for free in-game currency or hacks. The heuristic firings indicate that the PDF links to known malicious infrastructure and is designed as a game hack redirect. The document body reinforces this by containing text related to 'Free Robux' and a prominent URL.

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/free-robux-codes-on-android-2021-no-human-verification-game-hack In PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-hacked-pc-download_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-get-any-item-off-the-catalogue-for-free-2021_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-free-spins-no-generator_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/ulgames-resources-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-64-rom-hack_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-hack-roblox-players-acounts_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/games-on-roblox-where-you-win-a-free-stuff-2021_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/appsmobinfo-coinmasterhack-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-roblox-codes-for-robux-2021_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/where-to-buy-pubg-uc_GM1330123889.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-free-shoulder-friend_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/www-coinmaster_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-hack-robux-420-apk-aptoide_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-uk_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-bloxburg-free-play_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-coin-master-hack_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_off00002f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F7C 22732 bytes
SHA-256: 08ce97c42d0bff73849aa853ae975d03bfb2310857a4a4efe63902bc509026a1
font_01_sfnt_off00006286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6286 19912 bytes
SHA-256: 37de6caeef2547fa3b238fabaecee028c82aeca957f5f6717c3b7bfc56f34e7e