Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe66eda6448415bb…

MALICIOUS

PDF

34.9 KB Created: 2021-07-06 08:15:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 7c40a9e58313a99f33abc43dfacf1a69 SHA-1: 0f90f8c6ff44216c68299d882335fe2d99939864 SHA-256: fe66eda6448415bb366a053b8e0459fed8f71ef25d7fcb761136a432c9b7835c
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/406889139/coin-master-game-2021-free-spin-link-game-hack PDF link annotation
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-stuff-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/good-level-7-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-real-2021-500_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/adventure-story-hack-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-promo-codes-september-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-vehical-cheats_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-people-hack-into-your-roblox-account_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-hack-an-orator-club_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/hack-for-roblox-in-game_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-spins-link-2021-haktuts_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-its-free_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/counter-blox-roblox-offensive-cheats_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_off000031d2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31D2 22280 bytes
SHA-256: e3b5786abcedf33def74e76c53a0e844e8b3ec27d09aa2f0be7a9269326c3790
font_01_sfnt_off00006384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6384 19004 bytes
SHA-256: 0380ea631ae9459a709a33ae7c12e24ce61e57c36bba07f41eb8bd34d02fd060

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