Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c5e05d4435fe1e…

MALICIOUS

PDF

33.3 KB Created: 2021-07-06 13:40:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c85a2c2f7ec9348f0d4fa34710a7352a SHA-1: 5405c4b2123cd02d74e0f9c1e26e222c4292ed2d SHA-256: 91c5e05d4435fe1e93ab1b1d5d2c128a5a149f3248854704f9f2b598cbaee4f5
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains a large number of external links, many of which are disguised as PDFs themselves, pointing to websites offering 'free generators', 'game hacks', or 'free followers'. The primary lure appears to be related to popular games and social media platforms like TikTok and Roblox. The document's structure and content strongly suggest a link farm or phishing campaign designed to drive traffic to potentially malicious or scam-related websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/835599320/how-to-get-free-followers-and-likes-on-tiktok-game-hack PDF link annotation
    • https://goodtools.tw/upload/files/how-to-get-java-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-get-hacks-on-roblox-mobile-2021_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-roblox-roblox-free_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://goodtools.tw/upload/files/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://goodtools.tw/upload/files/promo-codes-for-free-stuff-roblox-2021_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/cheat-roblox-knife-capsules_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-robux-script_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-toys-codes-free-2021_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-roblox-without-verification_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-daily-free-coins-link-today_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-roblox-toy-codes-2021_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-jailbreak-how-to-get-all-cars-for-free_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/guess-the-song-cheat-sheet-roblox_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-free-gift-cards_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/guuudd-info-roblox-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_off00002f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F5B 21760 bytes
SHA-256: 784e3eab0f8d602b9ec03d061a26e287d95a3d0b815a196c8d246885b1171e0e
font_01_sfnt_off00005f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0C 18384 bytes
SHA-256: 95f10fab50896eebe3b3a16aa0c4712e68c05181c3e40d12974e1d4807889ad6

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