Malicious PDF — malware analysis report

Static analysis result for SHA-256 658fbdbafd4d8b64…

MALICIOUS

PDF

34.8 KB Created: 2021-07-04 05:48:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cf31f8722de38eebc5510f292ea0307c SHA-1: df794ad05cdbedb7751ae4be715a3a0b9473da8a SHA-256: 658fbdbafd4d8b649a1973fe2b53dd9d823c674bd6d9963fc510b5d00914c59c
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links and a call-to-action phrase, strongly suggesting a phishing or scam attempt. The document body and extracted URLs advertise hacks and free items for games, indicating a lure to trick users into visiting malicious sites. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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.tw/app/431946152/hack-para-jailbreak-roblox-2021-game-hack PDF link annotation
    • http://vavafashions.com/uploaded_files/userfiles/files/how-to-get-free-robux-and-any-item-free_GM431946152.pdfIn PDF document text
    • http://vavafashions.com/uploaded_files/userfiles/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://vavafashions.com/uploaded_files/userfiles/files/svandy-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://vavafashions.com/uploaded_files/userfiles/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://vavafashions.com/uploaded_files/userfiles/files/how-to-earn-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://vavafashions.com/uploaded_files/userfiles/files/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • http://vavafashions.com/uploaded_files/userfiles/files/game-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://vavafashions.com/uploaded_files/userfiles/files/coin-master-time-hack-ios_GM406889139.pdfIn PDF document text
    • http://vavafashions.com/uploaded_files/userfiles/files/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://vavafashions.com/uploaded_files/userfiles/files/install-free-game-coin-master_GM406889139.pdfIn PDF document text
    • http://vavafashions.com/uploaded_files/userfiles/files/roblox-freebies-com-hack_GM431946152.pdfIn PDF document text
    • http://vavafashions.com/uploaded_files/userfiles/files/ben-ten-roblox-game-online-free_GM431946152.pdfIn PDF document text
    • http://vavafashions.com/uploaded_files/userfiles/files/coin-master-hack-spins-android_GM406889139.pdfIn PDF document text
    • http://vavafashions.com/uploaded_files/userfiles/files/how-to-play-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://vavafashions.com/uploaded_files/userfiles/files/nilamyt-free-robux-socialblade_GM431946152.pdfIn PDF document text
    • http://vavafashions.com/uploaded_files/userfiles/files/roblox-admin-lua-script-hack_GM431946152.pdfIn PDF document text
    • http://vavafashions.com/uploaded_files/userfiles/files/2021-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://vavafashions.com/uploaded_files/userfiles/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://vavafashions.com/uploaded_files/userfiles/files/free-coins-2021-coin-master-link_GM406889139.pdfIn PDF document text
    • http://vavafashions.com/uploaded_files/userfiles/files/cool-minecraft-hacks_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_off000033b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33B1 21340 bytes
SHA-256: c40b22f83f47e7e7914fb1fafb8ea61cc6267119cbf1f3db7983a81d26610d9c
font_01_sfnt_off00006218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6218 19312 bytes
SHA-256: 5ba1e2ec4da91c7fa72703bdf47642010cdeaa4b2dec3fcff041172844c73de0

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