Malicious PDF — malware analysis report

Static analysis result for SHA-256 196e1fa1a80f1364…

MALICIOUS

PDF

34.0 KB Created: 2021-07-08 15:53:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e3ca44174a8e8c2a96d4afb03e3ed2cb SHA-1: 1e9021ceeaa9792ba57fc4aa5be1f57257305131 SHA-256: 196e1fa1a80f136435de8b8dfcecc2145809796abe1934684960a2192e28cacd
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 structured as SEO-optimized PDF files related to game hacks and free in-game currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, and 'PDF_GAME_HACK_REDIRECT_LURE' specifically points to a lure for game hacks. The ML classifier also strongly flagged this PDF as malicious. These findings suggest the document is designed to redirect users to potentially malicious sites or download further payloads.

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/coin-and-spin-game-hack PDF link annotation
    • http://ycstamping.com.tw/image/data/files/coin-master-daily-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/rbx-com_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-net-download-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-roblox-6-pack_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-free-cool-marshmello-shirts_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-play-roblox-hotel_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-online-games-like-minecraft_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-retail-tycoon-cheats-xbox-one_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-shirt-codes-free-shipping_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-mods-in-minecraft_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hacks-and-cheats_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spins-and-coins-com_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-free-models-virus_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-attacks-on-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-no-password-easy-obby-june-2021_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_off00002e3c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E3C 23324 bytes
SHA-256: 9d522ff626629cf8db93fc50de7211a24711900359d54c01561ee6977943e8fb
font_01_sfnt_off000062df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62DF 18080 bytes
SHA-256: 74e2f50f1d5b9f4143732ae52f695821b99bc90421c1d391145282a45e766ee9

Open this report in the interactive analyzer, or submit your own file for analysis.