Malicious PDF — malware analysis report

Static analysis result for SHA-256 f783465564cd0217…

MALICIOUS

PDF

43.6 KB Created: 2021-05-11 16:07:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: dfcc54d2932be122bbb691c9a59f247e SHA-1: 8ab4b57af4849e51ac5072b0702160d25dc0af3c SHA-256: f783465564cd02178f42b4dca853b28187686a7e4f41434e1e89858cdaa795ce
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which are SEO-optimized and point to sites offering game hacks and free currency for games like Coin Master and Roblox. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests a link farm or redirection to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/como-hackear-el-juego-coin-master-en-espaol-game-hack
    • http://zercalo.org/images/lazy-blocks-com-free-robux_GM431946152.pdf
    • http://zercalo.org/images/how-to-hack-coin-master-ios-2021_GM406889139.pdf
    • http://zercalo.org/images/coin-master-hack-version-2021-free-download_GM406889139.pdf
    • http://zercalo.org/images/moonactive-coin-master-free-spins-link_GM406889139.pdf
    • http://zercalo.org/images/roblox-svg-free_GM431946152.pdf
    • http://zercalo.org/images/coin-master-links-2021_GM406889139.pdf
    • http://zercalo.org/images/free-ways-to-get-robux_GM431946152.pdf
    • http://zercalo.org/images/is-there-a-way-to-get-free-robux_GM431946152.pdf
    • http://zercalo.org/images/free-robux-accounts_GM431946152.pdf
    • http://zercalo.org/images/how-do-you-get-free-roblox_GM431946152.pdf
    • http://zercalo.org/images/40-free-spins-coin-master_GM406889139.pdf
    • http://zercalo.org/images/add-robux_GM431946152.pdf
    • http://zercalo.org/images/how-to-earn-robux-for-free-2021_GM431946152.pdf
    • http://zercalo.org/images/how-to-get-free-robux-hack-2021_GM431946152.pdf
    • http://zercalo.org/images/free-coins-on-coin-master-2021_GM406889139.pdf
    • http://zercalo.org/images/village-4-coin-master_GM406889139.pdf
    • http://zercalo.org/images/is-roblox-free-on-nintendo-switch_GM431946152.pdf
    • http://zercalo.org/images/websites-to-get-free-robux_GM431946152.pdf
    • http://zercalo.org/images/robux-gift-card-free_GM431946152.pdf
    • http://zercalo.org/images/coin-master-links-free-spins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b56.bin
06e0bd22f966c8f64bb11edc88ecafe8767e922ddc3a0d16a521a134a8a26c32		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B56 25832 bytes
font_01_sfnt_off00008693.bin
9083091ab5034e7f8b54d6ac024e3b26c7561895c47ec5e954bca62b6dbdf25d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8693 18820 bytes

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