Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f7928a1c3b0f26…

MALICIOUS

PDF

34.5 KB Created: 2021-07-06 07:11:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5b37cc91ffa835c6d6dda72cf98fe334 SHA-1: a785391ebead75ccc205399855268254ec7ab91a SHA-256: 97f7928a1c3b0f265671beef04b82f676ae3d5ee72aabfc7447c43b87202143a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to malicious infrastructure. The document body and embedded URLs reinforce this by advertising free game hacks and generators. The primary IOC is the malicious redirector URL used in the lure.

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/best-free-minecraft-hacked-client-game-hack In PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/minecraft-free-exe_GM479516143.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/roblox-black-t-shirt-free_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/free-spins-coin-master-march-2021_GM406889139.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/www-roblox-robux_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/free-robux-pins_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/roblox-follower-bot-service-free_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/coin-master-free-spins-deutsch-download-ios-link_GM406889139.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/synapse-roblox-free_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/microsoft-rewards-free-robux_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/how-to-get-free-cards-for-coin-master_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
font_00_sfnt_off0000313f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x313F 22684 bytes
SHA-256: ce8666bde65f3275109a89a9c8644ec97a0b1b67da9739096e9c1a0dca824a11
font_01_sfnt_off00006395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6395 18492 bytes
SHA-256: de6dea86fd6d9d2ae37ee86cd92174b2735422e57a595b8bae0417e8dfd3f9d4

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