Malicious PDF — malware analysis report

Static analysis result for SHA-256 e42070934e5ccde8…

MALICIOUS

PDF

43.1 KB Created: 2021-05-19 22:39:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f6f7d8910363320c216b17743eefe8e8 SHA-1: c67c9c0352c9880f62542e28a27b40825fa889e2 SHA-256: e42070934e5ccde84f9032134b03982e3002a0eca06110671c90bd14bac5c274
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which are SEO-optimized and point to sites offering free game currency or hacks. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs suggests an attempt to redirect users to potentially malicious websites or download further payloads. The document body itself contains a URL related to obtaining Minecraft Java Edition for free, reinforcing the lure.

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/479516143/how-to-get-minecraft-java-edition-for-free-game-hack PDF link annotation
    • http://bufbd.org/images/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/coin-master-new-link-free-spin_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/what-is-coin-master-app_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/coin-master-spin-pattern_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/what-is-pubg-uc-carding_GM1330123889.pdfIn PDF document text
    • http://bufbd.org/images/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/how-to-sue-roblox_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/minecraft-free-school_GM479516143.pdfIn PDF document text
    • http://bufbd.org/images/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/easy-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/free-minecraft-mods-for-pc_GM479516143.pdfIn PDF document text
    • http://bufbd.org/images/how-to-hack-coin-master-2021_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_003_off00004d52.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D52 24956 bytes
SHA-256: a98ef6a47376da1d49ab6e439cc8569e4fcbd945b0e82ec40a6e326d26b68a5c
font_01_sfnt_off000085f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85F6 18328 bytes
SHA-256: a790f51109e75a7469d42ca78e2bb2ee6ca1fa0985c1c579ea7802a52011e373

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