Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a44e837cdcff3f…

MALICIOUS

PDF

46.7 KB Created: 2021-05-10 22:32:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f0b550f0edadafa6f434aff0d92ebd64 SHA-1: 6755e569d36dc8b4c44d49e557e868fe2f1e5d44 SHA-256: d9a44e837cdcff3f2f56f92a409a0ed19a62e3561dae773e68823a5b56b9969c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users into clicking on what appear to be game hack generators and free currency sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or SEO poisoning tactic. The primary URL, https://netcdn.xyz/app/406889139/coin-master-free-spins-and-coins-2021-game-hack, is likely the initial landing page for this lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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 https://netcdn.xyz/app/406889139/coin-master-free-spins-and-coins-2021-game-hack PDF link annotation
    • http://www.backlineservice.nl/images/free-spins-and-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/minecraft-pe-hack-client-ios_GM479516143.pdfIn PDF document text
    • http://www.backlineservice.nl/images/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/get-robux-com_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/coin-master-hack-2021-android-apk_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/coin-master-free-spin-download_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://www.backlineservice.nl/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/coin-master-hack-apk-33-download_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/coin-master-hack-tool-apk-download_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/how-to-get-robux-fast_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/coin-master-free-spin-daily-bonus_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/hack-minecraft_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a8b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A8B 26872 bytes
SHA-256: 8b81ee2c76fbb4bd10ceb94b91a1e3433fceb2f0bf5d0ea9ca04f3f6a8762ddd
font_01_sfnt_off00008862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8862 3204 bytes
SHA-256: 34e186eaedd0abe30d9918006f165105e5268ee5cd317aca3337fe6c60666134
font_02_sfnt_off00009365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9365 18460 bytes
SHA-256: c259e1f543e24e5bfe6ce8cf601a342cc00786119f62dbfadbed712250492c46

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