Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77368bcc2d43900…

MALICIOUS

PDF

42.0 KB Created: 2021-05-14 23:22:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3b473168f67d686646374bbc99f47a6c SHA-1: 2ebcbda685a3d931edb6a8d2c2d8e7cf6350ebbe SHA-256: f77368bcc2d43900872ff6a7ca3934ba708e4b70a3c788c144fdf53f668100ff
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links to external PDF documents, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous external links supports a link-farming or content distribution attack pattern. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these links.

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/free-spins-generated-from-coin-master-game-hack PDF link annotation
    • http://www.backlineservice.nl/images/free-attacks-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/coin-master-free-spins-and-coins-app-download_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/hack-coin-master-8-ball-pool_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/how-to-hack-coins-in-mcpe-master_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/coin-master-free-spins-instagram_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/get-robux-com_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/coin-master-daily-free-spins-link-app-download_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/coin-master-card-hack_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/free-minecraft-website_GM479516143.pdfIn PDF document text
    • http://www.backlineservice.nl/images/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/how-to-hack-roblox-to-get-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_off000049e5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49E5 24304 bytes
SHA-256: 5942fdfce192fa5c3fc0b45b05b9dabaf32b51b44fc74f08aa2654be6dcd6b30
font_01_sfnt_off0000819f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x819F 18320 bytes
SHA-256: d827f104b81aaf123e8ff1599fe12972b053c6881734e5a14a739a4b5a769c82

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