Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f884a697730fb0…

MALICIOUS

PDF

39.7 KB Created: 2021-05-20 05:45:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 52f84ca2207ad97439a413400d5cbe76 SHA-1: 6625e6bf09d6b89911196b22caa580aafe298c3a SHA-256: 78f884a697730fb0edb4e26e87095dc6ca5810beb413b0268890b9d13ff8be32
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many of which are SEO-optimized and point to pages offering free Robux or game hacks. This indicates a likely attempt to drive traffic to malicious or scam websites. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the document structure and embedded URLs strongly suggest a link farm or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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/is-it-possible-to-get-free-robux-game-hack PDF link annotation
    • http://hk-kan.org/images/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://hk-kan.org/images/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://hk-kan.org/images/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://hk-kan.org/images/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://hk-kan.org/images/coin-master-free-spins-and-coins-app-download_GM406889139.pdfIn PDF document text
    • http://hk-kan.org/images/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://hk-kan.org/images/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://hk-kan.org/images/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://hk-kan.org/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://hk-kan.org/images/haktutsin-2021-09-coinmaster50freespinandcoinlinkhtml-m-1_GM406889139.pdfIn PDF document text
    • http://hk-kan.org/images/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://hk-kan.org/images/minecraft-nintendo-switch-digital-code-free_GM479516143.pdfIn PDF document text
    • http://hk-kan.org/images/coin-master-hack-link_GM406889139.pdfIn PDF document text
    • http://hk-kan.org/images/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://hk-kan.org/images/coin-master-cheat-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://hk-kan.org/images/wurst-18-9_GM479516143.pdfIn PDF document text
    • http://hk-kan.org/images/coin-master-hack-tool-v1-9-pc_GM406889139.pdfIn PDF document text
    • http://hk-kan.org/images/free-roblox-shirt-templates-2021_GM431946152.pdfIn PDF document text
    • http://hk-kan.org/images/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • http://hk-kan.org/images/coin-master-for-pc-free-download_GM406889139.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_002_off0000403a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x403A 24700 bytes
SHA-256: 3fc0b0ce32d472ee434ecbe2beeea6957baa893731b5c04aec1d82c20462568e
font_01_sfnt_off00007890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7890 18464 bytes
SHA-256: 524b785793646940a6547919a11f6df6f4967036cf63710b5a4934c88ca16ae7

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