Malicious PDF — malware analysis report

Static analysis result for SHA-256 782332d701cb4b81…

MALICIOUS

PDF

46.5 KB Created: 2021-05-16 18:00:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ef7b01e04e4170a1ecd98ee35958bd2d SHA-1: 55f9348289244b52dce560793c433b96063e4a50 SHA-256: 782332d701cb4b81ef0f61648c37ea3607607e62e0fb95f6882bfead33063845
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are SEO-optimized and point to "free Robux" or "free spins" content, indicating a link farm designed to lure users. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious websites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/431946152/roblox-free-robux-no-human-verification-game-hack PDF link annotation
    • http://lawnn.ru/images/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://lawnn.ru/images/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://lawnn.ru/images/coin-master-free-spins-link-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://lawnn.ru/images/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://lawnn.ru/images/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://lawnn.ru/images/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://lawnn.ru/images/free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://lawnn.ru/images/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://lawnn.ru/images/coin-master-free-attack-link_GM406889139.pdfIn PDF document text
    • http://lawnn.ru/images/free-robux-come_GM431946152.pdfIn PDF document text
    • http://lawnn.ru/images/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://lawnn.ru/images/how-to-use-wurst_GM479516143.pdfIn PDF document text
    • http://lawnn.ru/images/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://lawnn.ru/images/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://lawnn.ru/images/hack-coin-master-using-pc_GM406889139.pdfIn PDF document text
    • http://lawnn.ru/images/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
    • http://lawnn.ru/images/coin-master-gold-cards-free-link_GM406889139.pdfIn PDF document text
    • http://lawnn.ru/images/earn-robux_GM431946152.pdfIn PDF document text
    • http://lawnn.ru/images/coin-master-hacks-reddit_GM406889139.pdfIn PDF document text
    • http://lawnn.ru/images/free-gfx-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004871.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4871 25688 bytes
SHA-256: cff93fc0115ce48fb0e8da0e5a69f7660d031eaab61592efc819dea5eccc3c34
font_01_sfnt_off00008468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8468 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000917a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x917A 18932 bytes
SHA-256: 9d302b82f438100f3cf39adb1b208b926e457e77310e02e89ba7e0c774768e38

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