Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3fdd76bcbda9d9…

MALICIOUS

PDF

42.3 KB Created: 2021-05-19 09:06:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3f70c99bfce3c7db8a64344b4b28fad9 SHA-1: 4bddf853ccbdc1d641a3b03cc8db79b404e4be1c SHA-256: 5b3fdd76bcbda9d9b71e3dc6ac0e473a35d3c9348414820487c1987e19d5b78b
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are SEO-optimized to appear as "free spin" or "hack" links for popular games. The ML classifier strongly indicated maliciousness, and the presence of a download button lure reinforces the deceptive nature of the document. The document's primary purpose appears to be directing users to download potentially harmful files from the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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/hack-coin-master-using-pc-game-hack PDF link annotation
    • http://www.flotom.at/images/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://www.flotom.at/images/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.flotom.at/images/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://www.flotom.at/images/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://www.flotom.at/images/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://www.flotom.at/images/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://www.flotom.at/images/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • http://www.flotom.at/images/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://www.flotom.at/images/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://www.flotom.at/images/coin-master-free-food_GM406889139.pdfIn PDF document text
    • http://www.flotom.at/images/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://www.flotom.at/images/coin-master-raid-hack_GM406889139.pdfIn PDF document text
    • http://www.flotom.at/images/coin-master-fan-club_GM406889139.pdfIn PDF document text
    • http://www.flotom.at/images/i-need-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.flotom.at/images/robux-for-surveys_GM431946152.pdfIn PDF document text
    • http://www.flotom.at/images/free-100-robux_GM431946152.pdfIn PDF document text
    • http://www.flotom.at/images/daily-free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.flotom.at/images/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.flotom.at/images/coin-master-200-spin-link_GM406889139.pdfIn PDF document text
    • http://www.flotom.at/images/earn-robux-for-roblox_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_off000047b1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47B1 25936 bytes
SHA-256: 4856689a41244a8385a7b466aaa87f7f431e5ae2375de4b0d7cc58c004851e3f
font_01_sfnt_off000082a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82A7 18344 bytes
SHA-256: f468976bec2b3a7af1fa08eb64faad271c21d08dd6b547722e42b35607b20a03

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