Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dbfbf87b19b2e81…

MALICIOUS

PDF

34.3 KB Created: 2021-07-03 16:07:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2e5b4932ebea4ef6c7b595123673e170 SHA-1: 30f9a984067a1c2061f9755873603aee43960788 SHA-256: 4dbfbf87b19b2e81df6a82dcc5385f8d3c03193bc917d3e44c665e714339da26
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that are identified as malicious redirectors, specifically leading to a lure for game hacks and free currency. The document body and heuristics confirm the intent is to trick users into visiting a malicious URL, likely for further exploitation or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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-spins-coin-master-ios-2021-game-hack In PDF document text
    • https://adventureglaciertreks.com/userfiles/files/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/free-robux-generator-real-2021_GM431946152.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/robux-com-roblox_GM431946152.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/coun-master_GM406889139.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/robux-withdraw_GM431946152.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/cute-free-roblox-clothes_GM431946152.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/roblox-game-hack-robux_GM431946152.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/roblox-free-no-download_GM431946152.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/coin-master-game-2021-free-spin-link_GM406889139.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/free-rich-roblox-accounts-and-passwords-that-work_GM431946152.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/free-100-robux_GM431946152.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/comment-devenir-hacker-sur-roblox_GM431946152.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/where-pokemon-go-free-download_GM1094591345.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/ac-market-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/roblox-robux-for-free-com_GM431946152.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/free-obc-accounts-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003128.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3128 22176 bytes
SHA-256: bd8d9a1c9a5f077546284de9b5ceb8b6bb3ce3ffc359fc6fefe4a1759abd79e4
font_01_sfnt_off0000626b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x626B 18576 bytes
SHA-256: 8762decffb793776951e27cb449b70ce975f8f4d9af12c2daa930bb9b077dfeb

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