Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9933b332bf6cca…

MALICIOUS

PDF

33.4 KB Created: 2021-07-04 01:16:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 3de6d9bb8c28047516e3735175acd091 SHA-1: cfbebec9c1dc2b1cf88fd17a27a57ad67add647c SHA-256: de9933b332bf6cca8292d7176f825e6135b8cec2ef72a67dd8d80652ba9226a0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically a site offering 'free generator / game hack' lures. The document body and extracted URLs indicate a social engineering attempt to trick users into visiting these sites, likely to download further malware or engage in scams. No scripts were extracted, but the PDF's structure and embedded links are sufficient to classify the attack pattern.

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/835599320/get-free-tiktok-likes-game-hack In PDF document text
    • http://library.fikes.upnvj.ac.id/repository/robux-hack-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-roblox-gift-card_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/mobile-for-free-24-roblox_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-treelands-hack_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-tiktok-likes-app_GM835599320.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/earn-robux-websites_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-best-free-items_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-earn-robux_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-sexually-abused_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-coin-master-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/blox-land-robux-free_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-spins-coin-master-app-iphone_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_off000030ac.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30AC 21792 bytes
SHA-256: c5eb4031a92a97bcd9c3c6e2bb52b34be60a7c9df651e0273c486a91e31f67e6
font_01_sfnt_off000060c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60C0 17972 bytes
SHA-256: effacd332746f9e646823f1c7fab4329f91a4bf6ea10d1b4c3cfc7ab1a2a3034

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