Malicious PDF — malware analysis report

Static analysis result for SHA-256 576e8870976619ce…

MALICIOUS

PDF

41.6 KB Created: 2021-05-12 22:38:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0604b0af3f9a636c1d741ccb62304aac SHA-1: 4686b2e91205a6c6c022ef7a70f879b76596308a SHA-256: 576e8870976619ce8a178dc2daa8905248ecb5c5de0150f3cc5fd1a8f1b010bf
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users to external sites, masquerading as generators or hacks for popular games. The primary redirector URL is identified as malicious, and the document body itself contains a large number of SEO-optimized PDF links, suggesting a link farm or content-spamming operation. No scripts were extracted, but the document's structure and embedded links strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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 https://netcdn.xyz/app/431946152/www-robux-com-game-hack In PDF document text
    • http://uptodate.az/images/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
    • http://uptodate.az/images/como-descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • http://uptodate.az/images/free-minecraft-mods-for-ps4_GM479516143.pdfIn PDF document text
    • http://uptodate.az/images/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://uptodate.az/images/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://uptodate.az/images/apps-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://uptodate.az/images/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://uptodate.az/images/coin-master-hack-online-2021_GM406889139.pdfIn PDF document text
    • http://uptodate.az/images/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://uptodate.az/images/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://uptodate.az/images/free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://uptodate.az/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://uptodate.az/images/earn-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://uptodate.az/images/mcpe-master-coins-hack-download_GM406889139.pdfIn PDF document text
    • http://uptodate.az/images/minecraft-noob-vs-pro-vs-hacker_GM479516143.pdfIn PDF document text
    • http://uptodate.az/images/minecraft-sign-up-free_GM479516143.pdfIn PDF document text
    • http://uptodate.az/images/roblox-free-login_GM431946152.pdfIn PDF document text
    • http://uptodate.az/images/free-spin-today-coin-master_GM406889139.pdfIn PDF document text
    • http://uptodate.az/images/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://uptodate.az/images/best-roblox-hacks_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_003_off00004677.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4677 24748 bytes
SHA-256: ec92e04669ac5be208ae3106f58e4f6e15516f81c9a3e8f7c059c540ef792434
font_01_sfnt_off00007f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F6B 18472 bytes
SHA-256: 5fb9c020dfaedbf87c4a2d1928ca13225aae827a6af2df864dcdcd5b9ec7e552

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