Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc13c83bad9ea212…

MALICIOUS

PDF

42.9 KB Created: 2021-05-11 18:43:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e831f9fe4b122f1693ce71fe3b6d361e SHA-1: a0053c7a3605923f8b533e5ec09648eab2699469 SHA-256: bc13c83bad9ea212df235a107f1300f6cfb00405051e7262eb4cc4957e39eef9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains links that redirect to malicious infrastructure, specifically promoting 'free generators' and 'game hacks' for popular mobile games. The heuristic firings indicate that these links are associated with known malicious redirectors and lure users with deceptive content. The embedded URLs and the document body text directly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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.
  • 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/406889139/coin-master-free-spons-apk-2021-game-hack In PDF document text
    • http://kontaktadig.se/images/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/roblox-svg-free_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/how-do-you-hack-for-2021000-coins-on-flip-master_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-free-spins-app-for-iphone_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/rbx-com_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/minecraft-windows-10-edition-hacks_GM479516143.pdfIn PDF document text
    • http://kontaktadig.se/images/robux-generator-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/feb-23-2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/minecraft-apk-free-download-016-0_GM479516143.pdfIn PDF document text
    • http://kontaktadig.se/images/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://kontaktadig.se/images/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • http://kontaktadig.se/images/minecraft-free-play-no-download_GM479516143.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_off00004996.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4996 25808 bytes
SHA-256: 081131ab36da3cdc15253da4cd0cb42cd6a067109c59272b9a5df83fb62cd6d3
font_01_sfnt_off0000849d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x849D 18456 bytes
SHA-256: 29cdb33c079fef0813399b5d3456e0cee6bb382532089b205a8c189028fb290e

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