Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50dbe57d0916439…

MALICIOUS

PDF

33.5 KB Created: 2021-07-03 19:48:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ece04196509d3a43cb4706bb9d967d87 SHA-1: 5a4402d2e83b218fddc8a2fdee683fc0e06d7f64 SHA-256: a50dbe57d091643980c26add28a17149c5c1f61796fe96ac0b85a6e5da111f24
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically advertising game hacks and generators. The document body, though partially corrupted, contains references to 'Roblox Hack Com' and URLs associated with game-related cheats and free accounts. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be luring users to a malicious redirector disguised as a game hack generator.

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-hack-com-game-hack In PDF document text
    • https://foc.vn/public/upload/files/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • https://foc.vn/public/upload/files/roblox-free-robux-hack-no-human-verification-youtube_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-roblox-computer-games_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-coin-master-spins-no-verification_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-free-spinv1-0apkpure-com-apk_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/pubg-uc-online-free_GM1330123889.pdfIn PDF document text
    • https://foc.vn/public/upload/files/como-descargar-hacks-para-roblox-booga-booga_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/get-2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/roblox-servers-free_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • https://foc.vn/public/upload/files/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-robux-cards_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-hack-version-2021-download_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-card-collection-link_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/minecraft-noob-vs-pro-vs-hacker-vs-god_GM479516143.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-gold-cards-hack-english_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/moonactive-free-spins-link_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_off00002d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D55 22116 bytes
SHA-256: e7313123f95a192bbfd4d3c880cbc41b7f0082baf2bb389f298beb292a31555e
font_01_sfnt_off00005e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E54 18916 bytes
SHA-256: 6d04b5b4db5b45e378875975e26f0e3af663697016fd07aaaf83c18ceb43a6ca