Malicious PDF — malware analysis report

Static analysis result for SHA-256 a274c6700208cc2b…

MALICIOUS

PDF

35.1 KB Created: 2021-07-03 22:55:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c3ade0f53b775e4ca234c6f15478e2c1 SHA-1: fad25867f75a7d93652552ddf8dcccbe7feedefd SHA-256: a274c6700208cc2b20f2f2006ecde4e2f56724b27832eedf03d670d6fd0ec207
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on vieclamjapan.com and appear to be part of a link farm designed to attract users searching for game hacks and cheats. The primary lure, 'free spins coin master', redirects to a malicious URL, indicating a likely attempt to drive traffic to potentially harmful content or facilitate further exploitation. The ML classifier strongly supports the malicious nature of this PDF.

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/406889139/free-spins-coin-master-twitter-game-hack PDF link annotation
    • https://vieclamjapan.com/upload/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/como-tener-anti-gravedad-en-roblox-hack-check-cashed_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/how-to-cheat-engine-roblox_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/coin-master-hack-no-survey-or-verification_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-no-verification-robux-generator_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-printable-roblox-coloring-pages_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/roblox-2021-february-fly-hack_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/roblox-synapse-x-free-key_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/roblox-oof-sound-free-download_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/how-to-become-a-hacker-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-minecraft-windows-10-account_GM479516143.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-robux-promo-codes-august-2021_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/can-i-download-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-pro-roblox-gear_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/no-human-verification_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/roblox-promo-code-to-get-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
stream_002_off00003258.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3258 23132 bytes
SHA-256: 9c3df26fc0c1e3a31eeddcf2268a83318207459f772287724ba388567a8987aa
font_01_sfnt_off00006663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6663 18336 bytes
SHA-256: fad18ba24583aad0ada5315d9085d0f54c571018171a48420ec776ee5c3fad25

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