Malicious PDF — malware analysis report

Static analysis result for SHA-256 781dce921ffb06dc…

MALICIOUS

PDF

34.3 KB Created: 2021-07-09 01:13:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 0505d31fb35ce0d9e68936990c584cd6 SHA-1: e46d7095031636f175bff1374f1de884e57fa738 SHA-256: 781dce921ffb06dc17acfa77ee15cb6170ad8b67a3f5d482d5ba5441e0dd706c
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file 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 4

  • 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/free-spin-coin-master-iphone-game-hack PDF link annotation
    • http://librarystkippgribl.com/repository/bux-free-robux_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/coin-master-free-food_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/how-to-get-the-dominus-crown-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-hack-2021-app_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/how-to-get-free-pet-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/rape-simulator_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-hack-ios-app_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/roblox-free-stuff-list_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/hackenrobloxdenn_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/free-spins-for-coin-masters_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/app-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/roblox-download_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-free-coins-and-spins-online-tool_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/how-to-hack-someones-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/free-robux-promo-codes-roblox_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/free-spins-coin-master_GM406889139.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_off000031b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31B7 22424 bytes
SHA-256: c8ceae73e8bccbdea90dd7fba71f2e1db2876729986162c98f7431d6878d16bf
font_01_sfnt_off00006386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6386 18340 bytes
SHA-256: 93824d9e1aceb83fcadc57d2324abd39ea6cbc22d65f7f2951186cf0df80c271

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