Malicious PDF — malware analysis report

Static analysis result for SHA-256 871906ee7214d0e9…

MALICIOUS

PDF

35.2 KB Created: 2021-07-06 07:16:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 932afa07d7f741880c1612b3497b8b4d SHA-1: 8f1da9830444a2517fd9de7d98b6d2b46c440582 SHA-256: 871906ee7214d0e9b05427b80b7d8fa2ed087bfac57e5fb7de8bb12bd0292a4e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a critical heuristic firing indicating it links to a known malicious redirector, specifically advertising a 'game hack'. The document body and extracted URLs reinforce this, showing lures for game-related cheats and free items. The primary IOC is the malicious redirector URL, which is likely used to deliver a second-stage payload.

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/479516143/minecraft-auto-miner-hack-game-hack In PDF document text
    • https://library.univthamrinaka.com/repository/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/free-tiktok-like_GM835599320.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/roblox-free-shirt-for-girl_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/free-shirts-pants-roblox_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/how-to-get-free-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/fre-dantdm-hair-roblox_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/coin-master-ultra-attack-hack_GM406889139.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/how-do-you-get-lots-of-robux-for-free_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/hacks-for-roblox-pet-simulator_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/free-robux-legit-2021-august_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/roblox-free-branch-crown_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/free-accounts-on-roblox-with-robux-2021_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/coin-master-free-box_GM406889139.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/roblox-hack_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/minecraft-mod-updater_GM479516143.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/roblox-online-free-unblocked_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
font_00_sfnt_off000034bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34BF 22588 bytes
SHA-256: 7afe778b8139ce18d09e86f5dfee8d910bd6b097e9737e2c4f9c593e4a13c5bd
font_01_sfnt_off00006732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6732 18308 bytes
SHA-256: cb04262464d4f5907c2b31d44269947acba11edbec1df8bc5e7062937e127060

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