Malicious PDF — malware analysis report

Static analysis result for SHA-256 b68c43106915e572…

MALICIOUS

PDF

44.0 KB Created: 2021-06-10 21:47:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: aefb5c8eca424422b93aee7a3f010372 SHA-1: c595eb026bd48bf1cdc62df0ca88e7df8da27ec7 SHA-256: b68c43106915e572c3d1ff0b7ccbc6aa8fb9cebb9ba087a920a0606e15fb5bfa
102 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or a method to distribute potentially unwanted content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs and a call-to-action button further support a malicious intent. No scripts were extracted, but the document's structure and numerous links point towards a lure for downloading software or engaging with scam-related content.

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/best-roblox-shirt-software-for-free-game-hack PDF link annotation
    • http://unifieo.br/images/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/free-robux-reddit_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/how-to-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://unifieo.br/images/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/how-to-get-free-skins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://unifieo.br/images/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/coin-master_GM406889139.pdfIn PDF document text
    • http://unifieo.br/images/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • http://unifieo.br/images/coin-master-blogspot_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_off00004f1e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F1E 25404 bytes
SHA-256: d8af7972d185cad13e870bfd170de985c9ea8b0415b9a0b3e5439dd5085e6a54
font_01_sfnt_off000087da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87DA 18732 bytes
SHA-256: 4246b0916d42ebba6b352e17a88e018caae589a478f2e5c91e2c2b644cbd2849

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