Malicious PDF — malware analysis report

Static analysis result for SHA-256 757a6712d31093e7…

MALICIOUS

PDF

44.2 KB Created: 2021-05-19 02:39:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3d42773d4d04c27812679bf048775417 SHA-1: 3086136d4f3ae5a7f1776f26cc769e84477a5a2e SHA-256: 757a6712d31093e72999dbfb551befb518f1aed20b9ef3f2f553a354a99bd680
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are structured as SEO-optimized slugs pointing to downloadable files. The document body and heuristics indicate a lure for game cheats and hacks, suggesting the intent is to trick users into downloading malware. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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-hacked-version-game-hack PDF link annotation
    • http://www.psychom.com/storage/editor/files/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://www.psychom.com/storage/editor/files/coin-master-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://www.psychom.com/storage/editor/files/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • http://www.psychom.com/storage/editor/files/how-to-get-java-minecraft-free_GM479516143.pdfIn PDF document text
    • http://www.psychom.com/storage/editor/files/coin-master-apk-hack-358_GM406889139.pdfIn PDF document text
    • http://www.psychom.com/storage/editor/files/roblox-premium-free_GM431946152.pdfIn PDF document text
    • http://www.psychom.com/storage/editor/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://www.psychom.com/storage/editor/files/coin-master-attack-madness-hack_GM406889139.pdfIn PDF document text
    • http://www.psychom.com/storage/editor/files/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.psychom.com/storage/editor/files/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://www.psychom.com/storage/editor/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://www.psychom.com/storage/editor/files/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://www.psychom.com/storage/editor/files/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://www.psychom.com/storage/editor/files/coin-master-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://www.psychom.com/storage/editor/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.psychom.com/storage/editor/files/how-to-get-free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://www.psychom.com/storage/editor/files/coin-master-hack-online-pc_GM406889139.pdfIn PDF document text
    • http://www.psychom.com/storage/editor/files/coin-master-free-spins-april-2021_GM406889139.pdfIn PDF document text
    • http://www.psychom.com/storage/editor/files/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.psychom.com/storage/editor/files/how-to-hack-roblox-accounts-passwords_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_off00004aa4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AA4 26976 bytes
SHA-256: e391edad388606760282d86cc4650b1ef52dac02384bdd10e31e2fc619f7e9bd
font_01_sfnt_off000089a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89A5 18608 bytes
SHA-256: 1ecc9580a68a9d8cddaeb68f5ba7642643800a9b47dfc5932154ad501a7e9da7

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