Malicious PDF — malware analysis report

Static analysis result for SHA-256 661be5ab62114fe1…

MALICIOUS

PDF

34.4 KB Created: 2021-07-09 12:08:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 145e32662c14a74e6c98c8ba68bf03cc SHA-1: 808a5ee7b2bd45bbc835fa73640ccf6ace0de406 SHA-256: 661be5ab62114fe12d00e7558a369d982f679153a81a7e5ece27bef3448a1822
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and references to game hacks and free in-game currency, specifically targeting popular games like Coin Master and Roblox. The primary lure directs users to 'http://netcdn.tw/app/406889139/free-coins-coin-master-game-hack', which is likely a malicious landing page designed to exploit user interest in free game items. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering tactic to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/406889139/free-coins-coin-master-game-hack PDF link annotation
    • https://foc.vn/public/upload/files/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-robux-co_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-mojang-account-with-minecraft_GM479516143.pdfIn PDF document text
    • https://foc.vn/public/upload/files/minecraft-java-edition-free-download-for-android_GM479516143.pdfIn PDF document text
    • https://foc.vn/public/upload/files/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-hack-online-no-human-verification_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/can-pokemon-go-free-coins_GM1094591345.pdfIn PDF document text
    • https://foc.vn/public/upload/files/roblox-shirt-codes-free-shipping_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/roblox-sword-fighting-tournament-points-hack-2021_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/how-can-someone-hack-roblox-account-frim-discord_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/hack-coin-master-ios-download_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-free-download-pc_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/how-to-get-free-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • https://foc.vn/public/upload/files/rake-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000031d0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31D0 22720 bytes
SHA-256: 3e8ea99af4214d5ad405a7472e5a5a30152fb4150b994b564d66526afae3a13c
font_01_sfnt_off0000649c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x649C 17996 bytes
SHA-256: db592684bbdaaeb7647633841870edbd5981f70e843d3403859f62ceb8e0c83d

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