Malicious PDF — malware analysis report

Static analysis result for SHA-256 820b49cdc66552d1…

MALICIOUS

PDF

44.1 KB Created: 2021-06-10 18:36:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b55267de60ab1b9a838af0ee05534d9b SHA-1: b0151210ca881bf4562fee13d5c33f6938375267 SHA-256: 820b49cdc66552d133d0aabaa3a0edd76e08a1f28513a4f822a0414e3b4bbd39
160 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and a prominent external URI pointing to sites offering game hacks and free items, suggesting a lure for users to download potentially malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or scam attempt. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/roblox-catalog-free-stuff-hack-game-hack In PDF document text
    • https://encounternepal.com/userfiles/files/free-minecraft-windows-10-account_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/is-minecraft-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-spins-coin-master-october-13-2021_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/regal-world-coin-master_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-hacks-for-gold-cards_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-free-followers-on-roblox_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-android_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-discord_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/wwwhaktutsin-2021-08-coinmasterfreespinandcoinlinkhtml-m-1_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-roblox-acc_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-websites-no-human-verification_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
stream_004_off00004fa8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FA8 25200 bytes
SHA-256: dfab185943f901848eec64711b0843e52565bf309c7bfddca8bd536ba29d942b
font_01_sfnt_off000087c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87C1 18880 bytes
SHA-256: 83e070d3260e7f7b5b29362aee256fa1d14e1f92a23222adff5a4a2e761ebb31

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