Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4287c1b527836c…

MALICIOUS

PDF

53.9 KB Created: 2021-05-19 18:40:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 1427ab0ec3ff862b338b073617312006 SHA-1: 2f42aa55454370fb1fd050923f52cd78c1a25b39 SHA-256: 0f4287c1b527836c43ed0f475981741fa097296c83704e17c598ff7552c28df4
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple embedded URLs that redirect to game hack and free currency generators, a common lure for phishing or malware distribution. The ML classifier also flagged this PDF as malicious. The document body and heuristics indicate a clear intent to trick users into clicking these links, likely leading to a second-stage download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8795

Heuristics 5

  • 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.
  • 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 https://netcdn.xyz/app/479516143/minecraft-skins-download-free-game-hack PDF link annotation
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-free-pet-food-links_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-roblox-accounts-that-work_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-hack-2021-iphone_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/60-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/how-to-win-robux_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/how-to-get-free-food-for-foxy-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/hack-coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-heaven-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/minecraft-apk-download-free-11-055_GM479516143.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/roblox-bux-free_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/roblox-free-items-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b42.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B42 26940 bytes
SHA-256: 5141587698d34466115ece3c8ae4e0d000386153275af95fb791d8ca109d5846
font_01_sfnt_off00008838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8838 7972 bytes
SHA-256: eaa1b4224a6962b9f6f86352b99971468550f59a685feb8f2aa8fc0bcc1dc5ce
font_02_sfnt_off0000a185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA185 4232 bytes
SHA-256: ab6320ab342704d2c5943abfba82ed4837bf2da871c91621741fd4cfd15c6ed5
font_03_sfnt_off0000b011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB011 18460 bytes
SHA-256: 54d3aeb7b3beebea3cfa48561b043312cf5d8c01a954df644a6f0691dd3f9e10

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