Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b1a2bc3cd45e24…

MALICIOUS

PDF

41.6 KB Created: 2021-05-16 03:05:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 79f0a117680b1410e6d76e0d51f853e6 SHA-1: 3ee9be6691e5fc73d9c86b4c6382bcf2ff1564be SHA-256: 87b1a2bc3cd45e24111d76d83f3895b13526c932d00ad8e2bf34c2261f14378e
102 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are SEO-optimized to appear as legitimate guides for game hacks, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure and the ML classifier's high confidence score indicate malicious intent. The document likely serves as a lure to download malicious payloads or redirect users to scam websites.

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/united-gaming-net-coin-master-hack-game-hack PDF link annotation
    • https://zszolesno.pl/images/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://zszolesno.pl/images/coin-master-32-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://zszolesno.pl/images/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://zszolesno.pl/images/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • https://zszolesno.pl/images/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://zszolesno.pl/images/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://zszolesno.pl/images/coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • https://zszolesno.pl/images/roblox-free-items-glitch_GM431946152.pdfIn PDF document text
    • https://zszolesno.pl/images/best-site-for-free-coin-master_GM406889139.pdfIn PDF document text
    • https://zszolesno.pl/images/roblox-free-clothes-generator_GM431946152.pdfIn PDF document text
    • https://zszolesno.pl/images/how-to-play-coin-master_GM406889139.pdfIn PDF document text
    • https://zszolesno.pl/images/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • https://zszolesno.pl/images/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • https://zszolesno.pl/images/how-to-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://zszolesno.pl/images/coin-master-download_GM406889139.pdfIn PDF document text
    • https://zszolesno.pl/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://zszolesno.pl/images/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • https://zszolesno.pl/images/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://zszolesno.pl/images/aternos-free-minecraft-server_GM479516143.pdfIn PDF document text
    • https://zszolesno.pl/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_off000046a3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46A3 25304 bytes
SHA-256: f17e91ada099678ecbd967369d0a3859500857bca00fb39c7f871c090a263fc4
font_01_sfnt_off00007f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F21 18624 bytes
SHA-256: cfeb828dedda213aee8682ea59dd941898f0663d73ad806f071fefcb0e9ee11f

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