Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf2b831f1d41c6a6…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 01:29:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: bb89c727fad1f6cedbd3ded56e48f89f SHA-1: 20ff891b1a7db809891aff20a7491e2daee975bd SHA-256: bf2b831f1d41c6a6a5ca37e99848ee54da9184377719271a47b48ffc599ca9c7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to a 'free generator / game hack' lure. The document body and embedded URLs reinforce this, directing users to a URL associated with game hacks. This indicates a social engineering tactic to trick users into visiting a malicious site, likely to download further malware or engage in other malicious activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/how-to-hack-coin-master-ios-jailbreak-game-hack In PDF document text
    • https://www.sonestad.se/library/repository/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/wwwcoin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/get-free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/awesome-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/hacked-case-clicker-roblox_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/como-hackear-coin-master-2021-espaol_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/multiplayer-master-hack-coins_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/como-tener-robux-hacks_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/how-to-crack-free-robux_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/roblox-play-now-for-free_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/minecraft-free-download-android_GM479516143.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-gifts_GM406889139.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_002_off000031f6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31F6 22944 bytes
SHA-256: f9bd216e8966e857c7531cf2fbbd069ddd3ea4bcf78e5ef2e2f93172f92d612d
font_01_sfnt_off0000656b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x656B 18564 bytes
SHA-256: 93c5f09ed49a64bd3339ac691ee5f88aee00b9e7a85e0b0b0901e6c59d799170

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