Malicious PDF — malware analysis report

Static analysis result for SHA-256 c858aff9ffdb5c98…

MALICIOUS

PDF

42.0 KB Created: 2021-05-14 19:02:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 407811735351e2ae79562fd3bb65e54c SHA-1: 220bbd0de8e7b2ad39b4deabe126bf5edaa3d581 SHA-256: c858aff9ffdb5c98114177d1ca4746b66864c92335d53034fefcbe1866d64a23
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 sites offering game hacks and free currency. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs suggests a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious campaign designed to redirect users to potentially harmful sites.

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/free-coins-and-spins-coin-master-game-hack PDF link annotation
    • https://dr-willmer.de/images/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • https://dr-willmer.de/images/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://dr-willmer.de/images/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://dr-willmer.de/images/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://dr-willmer.de/images/mcmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://dr-willmer.de/images/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • https://dr-willmer.de/images/is-minecraft-earth-free_GM479516143.pdfIn PDF document text
    • https://dr-willmer.de/images/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdfIn PDF document text
    • https://dr-willmer.de/images/free-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://dr-willmer.de/images/hack-version-coin-master-apk_GM406889139.pdfIn PDF document text
    • https://dr-willmer.de/images/coin-master-cheats-for-free-spins_GM406889139.pdfIn PDF document text
    • https://dr-willmer.de/images/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • https://dr-willmer.de/images/coin-master-free-spins-for-iphone_GM406889139.pdfIn PDF document text
    • https://dr-willmer.de/images/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • https://dr-willmer.de/images/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://dr-willmer.de/images/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
    • https://dr-willmer.de/images/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • https://dr-willmer.de/images/microsoft-rewards-roblox_GM431946152.pdfIn PDF document text
    • https://dr-willmer.de/images/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • https://dr-willmer.de/images/free-robux-pin-codes_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_off00004948.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4948 25212 bytes
SHA-256: 14102eb8f50b5a34ad5dc158474b4fa4fb810997df6b8f0de224e079065f69c8
font_01_sfnt_off0000828b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x828B 18060 bytes
SHA-256: f1068137021f01f6b5cc3550273fdf5362b49e27ffe305b66dd7920a08d48120

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