Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b3c8cf631af29d…

MALICIOUS

PDF

44.0 KB Created: 2021-05-16 19:45:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4a9d4934c84289f75787836e166c6907 SHA-1: 794c3e5ffea0c72a49a699294df6f118d4047494 SHA-256: e1b3c8cf631af29d6c8dc3edf5f23b776d7ef53d17872c15c4c5777f13eafe8c
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm designed to lure users. One prominent URL, https://netcdn.xyz/app/479516143/toolbox-apk-game-hack, indicates a potential download lure. The presence of a "QR-code redirect lure" heuristic and a "Visual download / call-to-action button lure" further supports the conclusion that this document is designed to trick users into clicking links and downloading content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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/toolbox-apk-game-hack
    • http://www.dolciariavarone.com/images/free-robux-generator-for-kids_GM431946152.pdf
    • http://www.dolciariavarone.com/images/how-to-get-free-robux-2021_GM431946152.pdf
    • http://www.dolciariavarone.com/images/roblox-images_GM431946152.pdf
    • http://www.dolciariavarone.com/images/how-to-hack-a-roblox-account-2021_GM431946152.pdf
    • http://www.dolciariavarone.com/images/robux-free-gift-card-org-hack_GM431946152.pdf
    • http://www.dolciariavarone.com/images/free-mods-for-coin-master_GM406889139.pdf
    • http://www.dolciariavarone.com/images/coin-master-pro-hack_GM406889139.pdf
    • http://www.dolciariavarone.com/images/how-to-get-free-robux-on-pc_GM431946152.pdf
    • http://www.dolciariavarone.com/images/free-robux-place_GM431946152.pdf
    • http://www.dolciariavarone.com/images/free-spin-link_GM406889139.pdf
    • http://www.dolciariavarone.com/images/how-to-install-minecraft-for-free-on-ios_GM479516143.pdf
    • http://www.dolciariavarone.com/images/how-to-get-free-roebucks-on-roblox_GM431946152.pdf
    • http://www.dolciariavarone.com/images/coin-master-daily-free-spin-and-coin-link-haktuts_GM406889139.pdf
    • http://www.dolciariavarone.com/images/coin-master-unlimited-spins-apk-free-download_GM406889139.pdf
    • http://www.dolciariavarone.com/images/freespinandcoin-blogspot-coin-master_GM406889139.pdf
    • http://www.dolciariavarone.com/images/coin-master-free-spins-link-today-instagram_GM406889139.pdf
    • http://www.dolciariavarone.com/images/coin-master-bonus_GM406889139.pdf
    • http://www.dolciariavarone.com/images/how-do-you-get-minecraft-for-free_GM479516143.pdf
    • http://www.dolciariavarone.com/images/minecraft-free-play-no-download_GM479516143.pdf
    • http://www.dolciariavarone.com/images/coin-master-free-spins-hack-apk-download_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049dd.bin
2de97d3adec35cb8b63e50bee8a56afaac05b4ba60cf2a2d8772d2732c53037c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49DD 24344 bytes
font_01_sfnt_off000080ac.bin
972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80AC 2820 bytes
font_02_sfnt_off00008a4b.bin
646fad9d756b15d24d99e1fc175dfd3628bdaadc493ae9366c014baed99d5fea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A4B 18048 bytes

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