Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc0e16fc169646b2…

MALICIOUS

PDF

35.8 KB Created: 2021-07-04 22:29:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 2e927bb8bf6d57e640dd033f9a542631 SHA-1: 14fd9e107496cd5f6bbd2989454a527a98f27328 SHA-256: fc0e16fc169646b2f5066baaca6f8dc9c0efcddd6a9a7b1e3001152eb1a3d1e3
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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/free-promo-codes-roblox-game-hack PDF link annotation
    • http://katalog.ireyogya.org/repository/how-do-you-get-free-robux-on-kindle-fire_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-game-hack-app-download_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/ban-hammer-roblox-free_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-bee-swarm-simulator-hack-download_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/cheats-coin-master-free-spins-and-news_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-hack-game-download-ios_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-hack-coin-master-in-pc_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-lumber-tycoon-2-free-vip-server_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-super-noob-obby-cheats_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-free-hair-codes_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/when-is-roblox-bloxburg-going-to-be-free_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-hack-a-private-server-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-assassin-hack-2021_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-roblox-red-shirt_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_off0000333b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x333B 22936 bytes
SHA-256: b58eadd66ae1c6c6b7ce080fc4e2fd9b5f35b1e32f037a95bcc5053bb6709dfb
font_01_sfnt_off0000665c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x665C 19236 bytes
SHA-256: 45e03afae7af1f260151d3edb1a0a3ab35e2bd18874eb1ddc5dcbe50b691d48c

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