Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d31a67d74d88fec…

MALICIOUS

PDF

34.1 KB Created: 2021-07-05 18:00:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2845f2f59bd0ee7b4320c0e221f2af51 SHA-1: c0209b029ff0f4dcdacf854cd4096bd2757f44f3 SHA-256: 8d31a67d74d88fecd3b560379b53495c3279611e4b7980c68e6a0a7051efa317
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links designed to lure users into clicking on what appears to be a 'free generator' or 'game hack'. These links redirect to malicious infrastructure, specifically http://netcdn.tw/app/431946152/roblox-free-robux-no-verification-game-hack, which is flagged as a known malicious redirector. The document body and heuristics indicate a social engineering tactic to trick users into visiting potentially harmful sites, likely as part of a phishing or malware distribution scheme.

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/roblox-free-robux-no-verification-game-hack In PDF document text
    • https://affinityinsure.ca/files/hack-to-protect-village-on-coin-master_GM406889139.pdfIn PDF document text
    • https://affinityinsure.ca/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://affinityinsure.ca/files/cmo-hackear-a-la-gente-en-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://affinityinsure.ca/files/free-robux-server_GM431946152.pdfIn PDF document text
    • https://affinityinsure.ca/files/free-robux-wheel_GM431946152.pdfIn PDF document text
    • https://affinityinsure.ca/files/how-to-install-hacks-to-roblox_GM431946152.pdfIn PDF document text
    • https://affinityinsure.ca/files/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • https://affinityinsure.ca/files/free-multiplayer-minecraft-server_GM479516143.pdfIn PDF document text
    • https://affinityinsure.ca/files/how-to-hack-a-roblox-account-with-hashes_GM431946152.pdfIn PDF document text
    • https://affinityinsure.ca/files/free-bling-bling-card-coin-master_GM406889139.pdfIn PDF document text
    • https://affinityinsure.ca/files/how-to-hack-computers-in-flee-the-facility-roblox_GM431946152.pdfIn PDF document text
    • https://affinityinsure.ca/files/roblox-vampire-hunters-2-cheats_GM431946152.pdfIn PDF document text
    • https://affinityinsure.ca/files/free-draw-2-roblox_GM431946152.pdfIn PDF document text
    • https://affinityinsure.ca/files/mc-hacks_GM479516143.pdfIn PDF document text
    • https://affinityinsure.ca/files/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://affinityinsure.ca/files/free-robux-generator-hack-2021_GM431946152.pdfIn PDF document text
    • https://affinityinsure.ca/files/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • https://affinityinsure.ca/files/hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • https://affinityinsure.ca/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • https://affinityinsure.ca/files/how-do-you-get-free-robux-on-roblox_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_off00002f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F55 22000 bytes
SHA-256: adfda29f876012a2064d17b0fcae92d8beabb84d03a2c2132e76bf79ec65467b
font_01_sfnt_off00005ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF9 19148 bytes
SHA-256: 8dddf83a8dc305c7bfb211f3bc3fbf3b1849d9dcf887b2c8b2fcb602871e3305

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