Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aeb5457e3d16d5d…

MALICIOUS

PDF

41.3 KB Created: 2021-05-10 21:37:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6779825805d782ac9076385f514fb8a5 SHA-1: 769359730c90fd093dedff5b27e9585fc5251a30 SHA-256: 3aeb5457e3d16d5d99c8d9cae0d4568303a991da088f0b669b957f66e69321b3
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which are SEO-optimized and point to sites offering "free spins" or "free robux." The ML classifier strongly flagged this PDF as malicious, and the presence of a "download button" heuristic suggests a deceptive user interface. The document's content and structure indicate it is part of a link farm designed to drive traffic to potentially malicious or phishing 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/coin-master-free-spins-twitter-game-hack PDF link annotation
    • http://wirelesscommsys.com/images/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • http://wirelesscommsys.com/images/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • http://wirelesscommsys.com/images/oprewards-login_GM431946152.pdfIn PDF document text
    • http://wirelesscommsys.com/images/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://wirelesscommsys.com/images/hack-coin-master-site-rssingcom_GM406889139.pdfIn PDF document text
    • http://wirelesscommsys.com/images/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://wirelesscommsys.com/images/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://wirelesscommsys.com/images/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://wirelesscommsys.com/images/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://wirelesscommsys.com/images/robux-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://wirelesscommsys.com/images/free-texture-packs-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://wirelesscommsys.com/images/free-mods-for-coin-master_GM406889139.pdfIn PDF document text
    • http://wirelesscommsys.com/images/coin-master-twitter-free-spins_GM406889139.pdfIn PDF document text
    • http://wirelesscommsys.com/images/free-roblox-script-executor_GM431946152.pdfIn PDF document text
    • http://wirelesscommsys.com/images/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://wirelesscommsys.com/images/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://wirelesscommsys.com/images/free-roblox-gift-card-codes-2021-unused_GM431946152.pdfIn PDF document text
    • http://wirelesscommsys.com/images/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • http://wirelesscommsys.com/images/free-spins-on-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://wirelesscommsys.com/images/coinmaster-free-cards_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_off000046dc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46DC 24624 bytes
SHA-256: 9de3bdefd865f9a8bc9e135a0f36053b4abbe17e96f9b8ac89a412721401c976
font_01_sfnt_off00007f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F81 18052 bytes
SHA-256: c7a08897dda8fd7aa1aaa0c20f8df2a538a05673267b13c95f426f14bc7355df

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