Malicious PDF — malware analysis report

Static analysis result for SHA-256 70266ede90e9860c…

MALICIOUS

PDF

33.9 KB Created: 2021-07-04 02:11:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: be52b4cd13fddda36706b8df26f7521c SHA-1: d08d486a2a739cf4491164d5c339618d107d77c7 SHA-256: 70266ede90e9860c1994d3fe0fde5b5d62b73cdfd6fe27d965e0a6fa955b177d
142 Risk Score

Malware Insights

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

The PDF document employs a game hack lure to redirect users to external websites, specifically http://netcdn.tw/app/431946152/fake-robux-codes-game-hack. This PDF is part of a link farm, containing numerous links to other PDFs hosted on 3qblocks.com.tw, all of which appear to be related to game cheats and free currency scams. The ML classifier strongly indicated maliciousness, supporting the assessment of a phishing and redirection attack.

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/431946152/fake-robux-codes-game-hack PDF link annotation
    • https://3qblocks.com.tw/image/data/files/roblox-how-to-play-games-for-free_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/how-to-hack-people-swim-roblox_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/roblox-ancient-erath-cheat-pastebin_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/client-minecraft_GM479516143.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/rbx-robux_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/bag-in-roblox-free_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/latest-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/how-to-hack-coin-master-with-root_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/roblox-studio-free-draw_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/how-to-get-free-admin-on-roblox-pastebin_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/roblox-login-free-games_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-roblox-promo-codes-for-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_off00002e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E76 22064 bytes
SHA-256: 0981d40c585ccb0dfb32e6083a0177e5763b9a01b9323fb1c5c7b60c8fcbd789
font_01_sfnt_off00005f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F5A 19060 bytes
SHA-256: 2e18dd916d7a66bb59c7260926acff12ee4ab5e46c7dbc77c6421b57fbe8e883

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