Malicious PDF — malware analysis report

Static analysis result for SHA-256 9181ac0c1715cf24…

MALICIOUS

PDF

34.9 KB Created: 2021-06-30 01:38:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f026f3df1920fba1eefeabe6bd528a5d SHA-1: ebeab402538f460cb844634a785c1dc0637bbe29 SHA-256: 9181ac0c1715cf245923514ec07365660d26dbd07b48ccfe41eb123174e425ef
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links to known malicious redirector infrastructure, specifically http://netcdn.co/app/431946152/how-to-hack-robux-with-cheat-engine-6.5-game-hack. The document body and extracted URLs suggest a lure for users seeking game cheats or free in-game currency, which is a common tactic for distributing malware. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 3

  • 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.co/app/431946152/how-to-hack-robux-with-cheat-engine-6.5-game-hack In PDF document text
    • https://foc.vn/public/upload/files/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-roblox-codes-2021-multiple-people-can-use_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/avast-cheat-roblox_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdfIn PDF document text
    • https://foc.vn/public/upload/files/minecraft-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-tiktok-hearts_GM835599320.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-spins-coin-master-2021-no-verification_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/how-to-get-roblox-hair-for-free_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-robux-no-password_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/roblox-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/roblox-jailbreak-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/mcpe-master-hack-unlimited-coins_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-robux-cards_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-roblox-promo-toy-keys_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/roblox-free-items-2021-october_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-coin-master-gold-cards_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-minecraft-bedrock-server-hosting_GM479516143.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_off00002f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F81 22296 bytes
SHA-256: ed2e914ae8bd833cc2b33a033661d8c650974fe19e41f08cc1db8a0b653f077e
font_01_sfnt_off000060d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60D4 19844 bytes
SHA-256: 4aae71f0859a90ac6775bd1ae570232bbda8f04ceb6dcffe6267e0d46a65a610