Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb5fbd3f49c68c0…

MALICIOUS

PDF

48.1 KB Created: 2021-06-08 18:31:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7a10a41c64049f3c0144d98b1026874f SHA-1: bebfaaac47be9c6d0f6ddbd70eac857a03c872f2 SHA-256: 8cb5fbd3f49c68c06ba507630eed5b96a446149c14e60ed957b47354b0ec9b7b
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs and a visual call-to-action, strongly suggesting a phishing or scam attempt to trick users into downloading malicious files. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of external URIs and the document's structure indicate an attempt to lead the user to a malicious download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 4

  • 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.tw/app/431946152/gift-roblox-com-free-game-hack PDF link annotation
    • http://dieter-sauter.com/images/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://dieter-sauter.com/images/cm-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://dieter-sauter.com/images/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://dieter-sauter.com/images/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://dieter-sauter.com/images/free-minecraft-resource-packs_GM479516143.pdfIn PDF document text
    • http://dieter-sauter.com/images/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://dieter-sauter.com/images/roblox-hack-robux-cheat-engine-64_GM431946152.pdfIn PDF document text
    • http://dieter-sauter.com/images/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://dieter-sauter.com/images/coin-master-apk-hack-download_GM406889139.pdfIn PDF document text
    • http://dieter-sauter.com/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://dieter-sauter.com/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://dieter-sauter.com/images/free-games-like-roblox_GM431946152.pdfIn PDF document text
    • http://dieter-sauter.com/images/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • http://dieter-sauter.com/images/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • http://dieter-sauter.com/images/coin-master-raid-hack_GM406889139.pdfIn PDF document text
    • http://dieter-sauter.com/images/free-robux-com-real_GM431946152.pdfIn PDF document text
    • http://dieter-sauter.com/images/robux-hacks-inspect-way_GM431946152.pdfIn PDF document text
    • http://dieter-sauter.com/images/roblox-20-body-free_GM431946152.pdfIn PDF document text
    • http://dieter-sauter.com/images/free-robux-october-2021_GM431946152.pdfIn PDF document text
    • http://dieter-sauter.com/images/coin-master-apk-hack-mod-download_GM406889139.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
stream_004_off000050f0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50F0 27000 bytes
SHA-256: 3b53e61c28d241434ff9367aba1b7e8d7d925a2f4d0ab4111dd02f67bc65447a
font_01_sfnt_off00008f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F0D 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off000098f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98F8 18432 bytes
SHA-256: 57f01cd6af575f81111b0ea02a2f294eb673924b45c4096f13cbbc81397876fb

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