Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d71ec025d1b832…

MALICIOUS

PDF

45.0 KB Created: 2021-06-07 16:31:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f37f707f27a45a5c40e281fc255141ea SHA-1: ca635202ed6e7270370cdfcac7ebf22e538335c2 SHA-256: 97d71ec025d1b83202e7a0b24b062b247b84165568621b04a42f1e3435c4d060
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to external websites. The document body, though partially corrupted, suggests lures related to 'free Roblox accounts' and 'game hacks'. The presence of many external links indicates a likely attempt to redirect users to malicious sites for phishing or malware downloads, aligning with spearphishing tactics. No scripts were extracted, but the extensive link farm is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/free-roblox-accounts-2021-with-game-hack PDF link annotation
    • http://atmos-service.com/images/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/free-spins-and-coins-com_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • http://atmos-service.com/images/coin-master-free-spins-ios-2021_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/free-robux-quiz_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/coin-master-free-spin-and-coin-link-today_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/abd-roblox_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/free-robux-com_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/roblox-redeem_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/coin-master-hack-apk-link_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • http://atmos-service.com/images/free-admin-roblox-gane_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/robux-free-co_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/how-to-get-free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/tiktok-free-views_GM835599320.pdfIn PDF document text
    • http://atmos-service.com/images/coin-master-hack-tool-generator_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/claim-coin-master-free-spins_GM406889139.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
stream_004_off000051e9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51E9 25496 bytes
SHA-256: ba14d8eb660f46fd1a6059933a59910d6bcd9cddfbe91ec38e458f6ac08f4d35
font_01_sfnt_off00008ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC7 19076 bytes
SHA-256: a3899638bf51e335cbc40673d1471e0832e9a39f88469ef4ed0809ba61e6f618

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