Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6f5c4908671419…

MALICIOUS

PDF

46.8 KB Created: 2021-05-15 07:53:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 26b9f523c7168d6fe00b00a2bf58d4d7 SHA-1: 8d8cbe98a78db95ec3104c4f55acca138714d95c SHA-256: 6b6f5c490867141979949482c0f00521e7a6d600a452dfb8a1ed70de2af7e48d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a document body that lures users with promises of free game currency and hacks. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, many of which point to PDF files hosted on 'ipdrs.org', suggesting a link farm designed to attract traffic. The ML classifier also flagged this PDF as malicious with a high score. While no scripts were directly extracted, the structure and content strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/431946152/how-to-get-free-robux-codes-2021-game-hack PDF link annotation
    • http://ipdrs.org/images/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://ipdrs.org/images/coin-master-spin-link-today-free_GM406889139.pdfIn PDF document text
    • http://ipdrs.org/images/coin-master-hack-without-verification-ios_GM406889139.pdfIn PDF document text
    • http://ipdrs.org/images/robux-win_GM431946152.pdfIn PDF document text
    • http://ipdrs.org/images/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://ipdrs.org/images/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ipdrs.org/images/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://ipdrs.org/images/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://ipdrs.org/images/coin-master-free-coins-today_GM406889139.pdfIn PDF document text
    • http://ipdrs.org/images/how-to-get-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://ipdrs.org/images/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://ipdrs.org/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://ipdrs.org/images/spin-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://ipdrs.org/images/password-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://ipdrs.org/images/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://ipdrs.org/images/master-hack-coin_GM406889139.pdfIn PDF document text
    • http://ipdrs.org/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://ipdrs.org/images/how-to-get-free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://ipdrs.org/images/how-to-get-free-coins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://ipdrs.org/images/coin-master-free-coins-and-spins-daily_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_003_off00004b55.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B55 25684 bytes
SHA-256: 231689c504afa3af2e5e33b691f78c6f1b7ffb10de54ae8ac66c7267f07c6dc9
font_01_sfnt_off00008605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8605 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off000092ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92AC 18856 bytes
SHA-256: 204886f9a3a3d456a8ba924f34e84de86e5dda13901e78a872ce278a746af401

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