Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98a914615c0d21f…

MALICIOUS

PDF

42.9 KB Created: 2021-06-03 09:50:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 34b99ec949686d009cc2f8b83a7f3dd6 SHA-1: 3f2de3b64a5bd0ea743167c59a93f7e4ca5e9cc9 SHA-256: a98a914615c0d21fbfea3b2896242a199154e5f80ca3e810351b4e82d386f2bc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, disguised as game hacks and generators. The document body and embedded URLs strongly suggest a lure to trick users into visiting these sites, which likely serve as a gateway to further malicious activities such as malware downloads. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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-card-hack-2021-game-hack In PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/what-are-points-for-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/mcpe_GM479516143.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/roblox-builders-club-free_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-minecraft-premium-account_GM479516143.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-robux-download_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-free-spins-cheat-codes_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-hack-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-free-download-app_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/blox-fish-free-robux_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_off00004b76.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B76 24732 bytes
SHA-256: de432ef6a694217a9a7401e9e3497ac90d1306ed8d76a77497975dde14ed34e7
font_01_sfnt_off000084c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84C6 18292 bytes
SHA-256: 56ed892f9c960ec28c91726eeb440a92294fcef820bc23b96874e10d7a9d3574

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