Malicious PDF — malware analysis report

Static analysis result for SHA-256 22dd1be13fff4f4b…

MALICIOUS

PDF

42.1 KB Created: 2021-05-19 16:00:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b988e16ff9851ce07c490efcca7abffa SHA-1: 55bbeb211ba8fc86c61aae5de17c5b2784402606 SHA-256: 22dd1be13fff4f4b90aa70253cdfebddfdbe38266e08e94a49b1d16a4683b4cb
102 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be SEO-farmed content related to game cheats and hacks. The ML classifier also flagged this PDF as malicious. The presence of a "download button" heuristic further suggests a lure to click these links, which likely lead to malicious sites or further downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/coin-master-daily-free-spins-link-facebook-game-hack PDF link annotation
    • http://regnataudio.com/images/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://regnataudio.com/images/free-coins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://regnataudio.com/images/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://regnataudio.com/images/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://regnataudio.com/images/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://regnataudio.com/images/free-robux-glitch_GM431946152.pdfIn PDF document text
    • http://regnataudio.com/images/coin-master-free-cards-link-2021-today_GM406889139.pdfIn PDF document text
    • http://regnataudio.com/images/roblox-bux-free_GM431946152.pdfIn PDF document text
    • http://regnataudio.com/images/coin-master-hack-tool-apk-download_GM406889139.pdfIn PDF document text
    • http://regnataudio.com/images/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://regnataudio.com/images/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://regnataudio.com/images/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://regnataudio.com/images/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://regnataudio.com/images/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://regnataudio.com/images/2021-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://regnataudio.com/images/coin-master-villages_GM406889139.pdfIn PDF document text
    • http://regnataudio.com/images/how-to-win-robux_GM431946152.pdfIn PDF document text
    • http://regnataudio.com/images/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://regnataudio.com/images/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://regnataudio.com/images/how-do-i-get-free-robux_GM431946152.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_003_off000048df.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48DF 24476 bytes
SHA-256: ff1c9a118b45a0e8ebd20d357c6eccde498a7b47f699d6cd68b6de4b91bb9c7c
font_01_sfnt_off00008122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8122 18636 bytes
SHA-256: 50d107b0548bd3d005e8b5e4f9cf847a43b3082c8a2089b5591d39299d79db66

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