Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a05f7565a2dcc7…

MALICIOUS

PDF

33.4 KB Created: 2021-07-05 21:52:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d8d085676b19dd2e7d3b69879e625377 SHA-1: 1fa9781fb6fe7f7f99c2d1a9f1e466784acf6c70 SHA-256: 41a05f7565a2dcc733f2b7447fdffa6a3529974392f456b1ca398b197f9fe5de
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/479516143/minecraft-pocket-edition-download-free-pe-calculator-game-hack PDF link annotation
    • http://lib.icbc-indonesia.org/repository/free-robux-how-to-game-kit_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-free-spin-app-apk_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/robux-hack-no-download-or-survey_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/fb-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/what-tiktok-free-fans_GM835599320.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-robux-generator-no-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/by-robux-hack_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/minecraft-hacks-pc_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-dominus-free_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-robux-that-really-works_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/how-to-get-free-robux-website_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_off00002f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F3C 21388 bytes
SHA-256: b3a7dfdca8c1de3857a943aeefb3b80ac67c10547c9757e07e462a556d30686b
font_01_sfnt_off00005da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA5 19044 bytes
SHA-256: 34b20f278f24286c6699cd4d98c19fc9e238f7be3ea9ba45b8deb04e7e0e65ff

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