Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1644b37b0cb78cc…

MALICIOUS

PDF

35.4 KB Created: 2021-07-06 06:19:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: df027ba685c5297b331674c813fe6bea SHA-1: 53b479910a1a0e32447b30918cdff188370df85a SHA-256: b1644b37b0cb78ccb1533f26ed7587babc0cb27004f249e229f05af5cb4dc163
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/earn-free-robux-for-roblox-game-hack PDF link annotation
    • https://c2o-library.net/catalog/repository/free-robux-24-info_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-robux-2021-hack_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-project-pokemon-hack-vermillion_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-on-ipad-mini_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-card-collection-hack_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-hack-tool-download_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-find-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/fly-hack-on-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-a-hack-script-in-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-do-you-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/auto-rob-new-roblox-jailbreak-hack-exploit-godmode_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-online-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-the-elite-radio-in-roblox-free_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-person_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-cheat-engine-lua-gui-scripts_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/xeno-hack-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-spins-coin-master-2021-app_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/ninja-legends-roblox-op-hack-script_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_off0000339c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x339C 22592 bytes
SHA-256: 0704e9860235b2d2a100dce5061ed912baa3a0d80a3060a142fbaf8f2f4a26e9
font_01_sfnt_off0000661f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x661F 18788 bytes
SHA-256: 098180cd614d2624df7268bdc42eb390b3940660e3b4a5d90fd1bd8a19720ac8

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