Malicious PDF — malware analysis report

Static analysis result for SHA-256 825fc57b659534ff…

MALICIOUS

PDF

43.6 KB Created: 2021-05-14 17:08:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 2bf8ea274ad83f99a2a9257cb5f30067 SHA-1: ccf8d8a82b706f7dd539f271dee9a996656548f8 SHA-256: 825fc57b659534ff9c6251ba0f9d40d25e33b6c29eca55dd325bbb6b3dd8acb7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external URLs, including one identified as a malicious redirector. The document body and heuristic firings indicate a lure for 'free generator' or 'game hack' content, which is a common tactic for distributing malware. The presence of embedded URLs and the nature of the lures suggest the document is designed to trick users into downloading or navigating to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/431946152/how-to-get-free-roebucks-on-roblox-game-hack In PDF document text
    • https://www.fishboat.hr/files/how-to-get-gold-cards-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://fishboat.hr/files/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://fishboat.hr/files/how-to-download-minecraft-for-free-on-windows_GM479516143.pdfIn PDF document text
    • http://fishboat.hr/files/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://fishboat.hr/files/coin-master-free-spins-app-for-iphone_GM406889139.pdfIn PDF document text
    • https://www.fishboat.hr/files/pig-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://www.fishboat.hr/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://fishboat.hr/files/static-moonactive-net-rewards_GM406889139.pdfIn PDF document text
    • http://fishboat.hr/files/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://fishboat.hr/files/free-spin-coin-master-instagram_GM406889139.pdfIn PDF document text
    • http://fishboat.hr/files/coin-master-free-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • https://www.fishboat.hr/files/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • http://fishboat.hr/files/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://fishboat.hr/files/grab-points-login_GM431946152.pdfIn PDF document text
    • http://fishboat.hr/files/minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://fishboat.hr/files/coin-master-exchange-40-free-spins_GM406889139.pdfIn PDF document text
    • http://fishboat.hr/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • https://www.fishboat.hr/files/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://www.fishboat.hr/files/easy-robux-today_GM431946152.pdfIn PDF document text
    • http://fishboat.hr/files/free-robux-no-human-verification_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_off00004ad9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AD9 26340 bytes
SHA-256: d7217af62e59ba0a494009c10db4a7d12d35925925162a4da825ce7d8547070f
font_01_sfnt_off0000875d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x875D 18524 bytes
SHA-256: b7643ab87c6ede69648f322cd81a197be2475f7126f117e622ee98ccb7431d7c

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