Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4795aa38765e4de…

MALICIOUS

PDF

33.1 KB Created: 2021-07-05 20:19:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3edda8eea683491f0695aab93bd43109 SHA-1: 7a355fcdabe13ab378eb5cb805296ead5702f509 SHA-256: d4795aa38765e4de9b783fab7964596a9aca1950d809ef0acd95a13ef1003c5f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links to other PDFs, presented as 'game hacks' and 'free items', which is indicative of a link farm or SEO manipulation tactic. The primary URL http://netcdn.tw/app/479516143/free-minecraft-skins-game-hack is a redirector, suggesting a potential distribution point for malicious content or ad fraud. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/free-minecraft-skins-game-hack PDF link annotation
    • https://lib.bunghatta.ac.id/app/repository/free-model-purchase-request-roblox-spam_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-free-vip-server_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/gaming-dunia-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-free-dragon-ball-z-games_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-vehicle-simulator-free-money_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/robux-giver_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-instal-roblox-hack_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-jailbreak-hack-money-generator_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-clothes-and-hats-on-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-get-gamepasses-for-free-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-get-cloth-goku-free-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/coin-master-online_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/god-hack-on-roblox-with-check-cashed_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-robux-generator-2021-no-verification_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-cheat-in-roblox-royale-high_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/hack-para-tener-robux-como-tener-robux-gratis-enderrobux-117_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-adopt-me-money-hack_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/robux-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-get-free-robuxs-the-add_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_off00003043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3043 21596 bytes
SHA-256: b3c4a50225397d01dcb1de3f922f3f64da1b162ce4175f6a16d7dc4a4cf2e6dd
font_01_sfnt_off00005f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F5F 18024 bytes
SHA-256: 4c34e1d22b35053a5a8667e53a0f3af933e1164b6abdc04fe0b1b81d052ba95f

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