Malicious PDF — malware analysis report

Static analysis result for SHA-256 35fafa80b2362bc2…

MALICIOUS

PDF

33.6 KB Created: 2021-06-27 15:21:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 56e6d1e29e1907fedc59da322dffec6d SHA-1: 4f81a5219f695afa26b48ad842720ba3cb9e5fe1 SHA-256: 35fafa80b2362bc2377a5601e5b7515f18029cd5e6e61d11994ca5f8c2ff4d80
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which are disguised as guides for popular games and lead to CAPTCHA pages. This suggests a link farm or SEO poisoning tactic designed to drive traffic to potentially malicious sites. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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.co/app/431946152/roblox-sunset-city-how-to-sell-furniture-no-hack-game-hack PDF link annotation
    • https://www.awmedicine.com/uploaded_files/userfiles/files/coin-master-free-spin-27_GM406889139.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-blog_GM406889139.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/free-pet-treats-coin-master_GM406889139.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/how-to-get-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/how-to-hack-lvl-dragon-ball-final-stand-roblox_GM431946152.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-captcha_GM431946152.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/coin-master-400-spin-link-hack_GM406889139.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/coin-master-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/minecraft-pocket-edition-mods-for-free_GM479516143.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/earn-robux-today_GM431946152.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/roblox-ftw_GM431946152.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/app-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • https://www.awmedicine.com/uploaded_files/userfiles/files/how-to-get-infinite-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
font_00_sfnt_off00002c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C26 22388 bytes
SHA-256: dfc2a4d2f04399764fbb6eaceee8d919c4aa6941985d6781e9a3d03707012c0b
font_01_sfnt_off00005d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D13 19528 bytes
SHA-256: f9020958b2828ded387c45f16b84504bbcc46c0ee6810904191a7264d58815d3

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