Malicious PDF — malware analysis report

Static analysis result for SHA-256 43193a69a274777f…

MALICIOUS

PDF

42.5 KB Created: 2021-05-13 10:30:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ac2d4198754ae9fefcc0d5f2048dca4a SHA-1: c58935578faa343ebc56f5f13a021323d6b4e88f SHA-256: 43193a69a274777f8ddbb3b0d11e8302f62f0236d153da55b5d188f7da2ca8c9
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a lure, presenting a fake CAPTCHA to trick users into interacting with malicious links. The document contains a large number of external links, many of which point to SEO-optimized PDF files related to game hacks and free currency, suggesting a link farm or scam operation. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/facebook-coin-master-hack-game-hack PDF link annotation
    • http://www.laborvetro.org/images/how-to-get-free-minecraft-coins_GM479516143.pdfIn PDF document text
    • http://www.laborvetro.org/images/card-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.laborvetro.org/images/coin-master-online-hack-download_GM406889139.pdfIn PDF document text
    • http://www.laborvetro.org/images/free-game-pack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.laborvetro.org/images/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.laborvetro.org/images/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://www.laborvetro.org/images/how-to-get-free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.laborvetro.org/images/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://www.laborvetro.org/images/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.laborvetro.org/images/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://www.laborvetro.org/images/coin-master-332-apk-free-download_GM406889139.pdfIn PDF document text
    • http://www.laborvetro.org/images/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://www.laborvetro.org/images/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • http://www.laborvetro.org/images/avatar-the-last-airbender-roblox_GM431946152.pdfIn PDF document text
    • http://www.laborvetro.org/images/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.laborvetro.org/images/adopt-me-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://www.laborvetro.org/images/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • http://www.laborvetro.org/images/robux-online_GM431946152.pdfIn PDF document text
    • http://www.laborvetro.org/images/where-can-i-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.laborvetro.org/images/get-robux-for-free-2021_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_off00004d1c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D1C 24232 bytes
SHA-256: fd32eb610118b72e13a3f0f19afae20ad34ba4e58e45846071747314861606bf
font_01_sfnt_off00008479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8479 18040 bytes
SHA-256: 05bcd154b4b80bf0f53e2a3055e74399dc4b8dcd1da6948cfb392e39c16bc03c

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