Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ffc92a7379e051…

MALICIOUS

PDF

44.3 KB Created: 2021-06-03 04:53:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 93dc8251ea26a7520d48851318911445 SHA-1: d76913d3c3dd0f56a7023e9f95172e78b2fdc561 SHA-256: 84ffc92a7379e0512e5c8389e211237f1c9c1afc661c9502d7319cac7f635ba3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as game hacks and generators, which are likely intended to trick users into downloading further malicious content. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/coin-master-free-coins-game-hack In PDF document text
    • http://slim.sisminkada.net/repository/roblox-free-printables_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/minecraft-free-download-mac-full-version_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/offers-for-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-village-cost_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-hack-someones-minecraft-account_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-do-you-hack-for-2021000-coins-on-flip-master_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-spins-for-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-minecraft-resource-packs_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-codes-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_004_off00005313.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5313 25348 bytes
SHA-256: 3eac64f188f683de2f141ef31131a047f898643b0fa71e0be6e934b8c3e3e214
font_01_sfnt_off00008c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C50 17712 bytes
SHA-256: 0afd6f2792edb83b7f2a0201a1e0a5eb12ca81ad868fb3e42742340ee6e5fb0e

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