Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5e436314c33605…

MALICIOUS

PDF

47.7 KB Created: 2021-06-11 00:52:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cb7ae1f616d17b5932af5b8dd201e3dd SHA-1: 1194b54db81ffd1d729152aef9a6ecb2bd2f9f7d SHA-256: 9b5e436314c3360591d4c71d6de39cadc7f2c69e91781df08f07eb68c49cb65c
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 0.9769

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 https://netcdn.tw/app/431946152/cloudbux-net-roblox-hack-game-hack PDF link annotation
    • http://oca.undil.tl/repository/free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-admin-free-spins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-hack-a-player-in-roblox_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/download-coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-32-mod-hack-unlimited_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/toolbox-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-watch-ads-for-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-dominus-roblox_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-moonactive_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-do-u-scamm-people-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-2021-ios-download_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/hackear-roblox-gratis_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-free-android_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/robux-earner_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-level-7-exploit-roblox-no-virus_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052d3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52D3 25112 bytes
SHA-256: 269b582b2d1a746a5a8df9ddaea4c0757b82d133ddd7c87e140a34db700b337a
font_01_sfnt_off00008cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC1 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off00009683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9683 18600 bytes
SHA-256: cf6219fb64d7c520650d936fd5efe736d65f6b3725254acb218c5fbb78b4600f

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