Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bfb378eddeb8f12…

MALICIOUS

PDF

36.0 KB Created: 2021-07-03 13:33:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 0cd2ac5c301cead8fe2ce59d60619883 SHA-1: fd65921ca35a1bd266408cb752e2a80c3258c93b SHA-256: 1bfb378eddeb8f120ccc762e0e1d9f443ab92241469032ffe707bb1e147db487
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-free-spin-codes-game-hack PDF link annotation
    • http://mismiftahululumsentul.sch.id/__statics/gudangsoal/files/minecraft-pocket-edition-apk-free-download_GM479516143.pdfIn PDF document text
    • http://mismiftahululumsentul.sch.id/__statics/gudangsoal/files/roblox-robux-cheaten_GM431946152.pdfIn PDF document text
    • http://mismiftahululumsentul.sch.id/__statics/gudangsoal/files/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://mismiftahululumsentul.sch.id/__statics/gudangsoal/files/roblox-restaurant-tycoon-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://mismiftahululumsentul.sch.id/__statics/gudangsoal/files/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • http://mismiftahululumsentul.sch.id/__statics/gudangsoal/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://mismiftahululumsentul.sch.id/__statics/gudangsoal/files/robux-online_GM431946152.pdfIn PDF document text
    • http://mismiftahululumsentul.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://mismiftahululumsentul.sch.id/__statics/gudangsoal/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://mismiftahululumsentul.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://mismiftahululumsentul.sch.id/__statics/gudangsoal/files/roblox-commands-hack_GM431946152.pdfIn PDF document text
    • http://mismiftahululumsentul.sch.id/__statics/gudangsoal/files/how-to-insert-lua-script-into-roblox-using-cheat-engine_GM431946152.pdfIn PDF document text
    • http://mismiftahululumsentul.sch.id/__statics/gudangsoal/files/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • http://mismiftahululumsentul.sch.id/__statics/gudangsoal/files/roblox-hacks-project-alpha_GM431946152.pdfIn PDF document text
    • http://mismiftahululumsentul.sch.id/__statics/gudangsoal/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://mismiftahululumsentul.sch.id/__statics/gudangsoal/files/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://mismiftahululumsentul.sch.id/__statics/gudangsoal/files/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://mismiftahululumsentul.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://mismiftahululumsentul.sch.id/__statics/gudangsoal/files/coin-master-free-cards-and-spin-link_GM406889139.pdfIn PDF document text
    • http://mismiftahululumsentul.sch.id/__statics/gudangsoal/files/roblox-giveaways-top-hack_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_off000035fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35FB 23100 bytes
SHA-256: 3fdd5832a6c41b8147cd5780039ee1cab3c3aba302c31148fc99e4e3d84ca4f9
font_01_sfnt_off000069fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69FC 18348 bytes
SHA-256: 9e9c4f8be19f0ad0d41979f724cf6b1bf7467f7e43e4e9071540c80937701c51

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