Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3a6638d809bcb0…

MALICIOUS

PDF

33.7 KB Created: 2021-06-20 19:49:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1fbc9ba68bb6c6d22475fbec6e2b4f7e SHA-1: e504130d2f14eba064a8e0c8d16224b5c7556280 SHA-256: bf3a6638d809bcb08dad6f4e1e9b67079e5b6bb0b849d9eae31a77bc5114b79e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.co/app/431946152/como-instalar-hacks-de-roblox-en-anime-ultimate-game-hack. The document body text and heuristics indicate a lure related to game hacks and currency generators, suggesting the intent is to redirect users to potentially malicious sites for scams or further malware delivery. No scripts were extracted, but the embedded URLs and redirector findings are strong indicators of malicious intent.

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/como-instalar-hacks-de-roblox-en-anime-ultimate-game-hack In PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/ear-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/free-robux-real-working_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/free-2021-robux_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/roblox-free-online-game-demo_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/coin-master-hack-spins-apk_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/when-was-minecraft-free_GM479516143.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/free-roblox-girl-hair-not-a-model_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/descargar-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/is-free-robux-real_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/coin-master-free-spins-glitch_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/roblox-purple-guy-shit-free_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/where-tiktok-free-view-iphone-11_GM835599320.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/how-to-get-actual-free-robux_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_off00002d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D57 22032 bytes
SHA-256: 94a61327669102bc54d8fe81ca16d220a556008482120a4f6144b80998cc99e4
font_01_sfnt_off00005e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E02 19308 bytes
SHA-256: a3d6314de2f5e980f13b24766f19413589dcd18c3ee23343911f008400e40add