Malicious PDF — malware analysis report

Static analysis result for SHA-256 af51ab7061c4a264…

MALICIOUS

PDF

34.8 KB Created: 2021-06-30 11:22:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 369356da33bd4ebe0f828428246e584c SHA-1: d3371bdc222a38987143de56328d2b7794fe2e6b SHA-256: af51ab7061c4a2646e070eb7891e46cc441416dff905aa74a11ff16791bc59f8
160 Risk Score

Malware Insights

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

The PDF contains embedded links and text explicitly referencing 'free Robux' and 'game hacks', designed to trick users into clicking. The primary embedded URL, http://netcdn.co/app/431946152/free-robux-serveys-game-hack, is flagged as a malicious redirector. This suggests the document's purpose is to act as a lure for 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.co/app/431946152/free-robux-serveys-game-hack In PDF document text
    • https://www.fhccu.com/images/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • https://www.fhccu.com/images/how-to-hack-roblox-without-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • https://www.fhccu.com/images/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.fhccu.com/images/free-robux-no-deals_GM431946152.pdfIn PDF document text
    • https://www.fhccu.com/images/coin-master-invite-friends-hack_GM406889139.pdfIn PDF document text
    • https://www.fhccu.com/images/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • https://www.fhccu.com/images/hack-btools-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://www.fhccu.com/images/cheat-codes-for-bank-tycoon-roblox_GM431946152.pdfIn PDF document text
    • https://www.fhccu.com/images/roblox-cs-ro-hack_GM431946152.pdfIn PDF document text
    • https://www.fhccu.com/images/dowload-roblox-for-pc-free_GM431946152.pdfIn PDF document text
    • https://www.fhccu.com/images/free-roblox-grouup-bots_GM431946152.pdfIn PDF document text
    • https://www.fhccu.com/images/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.fhccu.com/images/https-wwwrobloxcom-games-2021202196-freeubersummerrewards_GM431946152.pdfIn PDF document text
    • https://www.fhccu.com/images/free-hair-roblox-blue_GM431946152.pdfIn PDF document text
    • https://www.fhccu.com/images/cheat-sur-magnet-simulatore-roblox_GM431946152.pdfIn PDF document text
    • https://www.fhccu.com/images/how-to-get-free-robux-no-waiting_GM431946152.pdfIn PDF document text
    • https://www.fhccu.com/images/20-free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://www.fhccu.com/images/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • https://www.fhccu.com/images/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • https://www.fhccu.com/images/roblox-unltimate-driving-cheats_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_002_off0000304c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x304C 22716 bytes
SHA-256: 0fc626cacc804f367ad36e1a85facb608ba309b86bc5636bda29c03cdcfce324
font_01_sfnt_off000062e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62E2 19012 bytes
SHA-256: 8f068445611c8339f2cee7f839b944b644045e5db0548bdfbbcfb245f5dc8223