Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b26dd39067b055…

MALICIOUS

PDF

34.9 KB Created: 2021-07-08 17:11:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c5e6fabdfeec1a70ed6f8b811619b807 SHA-1: b6e5524ef209af62fb76550d8fde732ebcb13586 SHA-256: 81b26dd39067b055b88e01643bba68f1a2775e62feed6dec04e5e767de5ef30c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically promoting 'free generators' and 'game hacks'. The primary redirector URL is http://netcdn.tw/app/406889139/free-spin-coin-master-2021-game-hack. This indicates a social engineering lure designed to trick users into visiting potentially harmful sites. No scripts were extracted, but the presence of multiple malicious links and a high ML classifier score strongly suggests a malicious intent.

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/free-spin-coin-master-2021-game-hack In PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/how-to-get-free-tiktok-followers-without-downloading-apps_GM835599320.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/all-coin-master-spin-link-and-free-download_GM406889139.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/free-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/freerobux-co_GM431946152.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/roblox-free-followers_GM431946152.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/hack-robux_GM431946152.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/roblox-como-hackear-una-animacion-para-tenerla-gratis_GM431946152.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/how-do-you-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/tiktok-free-netflix_GM835599320.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/i-want-free-robux_GM431946152.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/earn-robux-today_GM431946152.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/minecraft-cheats-pc-2021_GM479516143.pdfIn PDF document text
    • https://terapivitalitasjogja.com/ckfinder/userfiles/files/roblox-free-robux-no-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_002_off000030f6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30F6 23016 bytes
SHA-256: 2b22815039c16f3ef28791427a3505a1d052994eb2715329c1ba4decb2f5c6e6
font_01_sfnt_off000064c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64C2 18576 bytes
SHA-256: 3af2a790f1bd7a3afb398ecfc348a5559e4db05f514a45e9361d5c46150add68

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