Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d77ff06a29b782…

MALICIOUS

PDF

50.1 KB Created: 2021-06-13 19:25:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 5d6f6fc0a7be8380e85f820d9e50fb28 SHA-1: a397498232f921847d7b048d7b3d6b427690fb27 SHA-256: 85d77ff06a29b7822ffd65eccaeaf8a519db7f014085ee3199b0c7a805b8ca1a
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links to external websites, many of which are structured as SEO-optimized PDF links, suggesting a link farm or content aggregation tactic. The ML classifier and PDF link farm heuristics strongly indicate malicious intent, likely to redirect users to sites offering game cheats or potentially malware. The document body and extracted URLs point towards a lure for game-related exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9349

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.co/app/431946152/roblox-jailbreak-free-money-march-2021-game-hack PDF link annotation
    • http://www.copoint.co.uk/images/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • http://www.copoint.co.uk/images/how-to-get-speed-hacks-on-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://www.copoint.co.uk/images/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://www.copoint.co.uk/images/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • http://www.copoint.co.uk/images/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.copoint.co.uk/images/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • http://www.copoint.co.uk/images/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdfIn PDF document text
    • http://www.copoint.co.uk/images/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.copoint.co.uk/images/bowtie-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.copoint.co.uk/images/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://www.copoint.co.uk/images/set-hack-robux_GM431946152.pdfIn PDF document text
    • http://www.copoint.co.uk/images/roblox-change-name-hack-pastebin_GM431946152.pdfIn PDF document text
    • http://www.copoint.co.uk/images/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://www.copoint.co.uk/images/fb-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.copoint.co.uk/images/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.copoint.co.uk/images/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • http://www.copoint.co.uk/images/robux-com-free_GM431946152.pdfIn PDF document text
    • http://www.copoint.co.uk/images/how-to-use-cheat-engine-on-roblox-mac_GM431946152.pdfIn PDF document text
    • http://www.copoint.co.uk/images/script-hack-roblox-phantom-forces_GM431946152.pdfIn PDF document text
    • http://www.copoint.co.uk/images/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A82 33800 bytes
SHA-256: e7bf0b3379992099e262b82a358d906b32c756af73daab147798e20e28a189e6
font_01_sfnt_off0000945c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x945C 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off00009dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DFC 19576 bytes
SHA-256: a9e94f345d52ca1429a757527af31c183d8254a7001b727356cab0f389aafcd9

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