Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db4a66bed7d18f3…

MALICIOUS

PDF

44.9 KB Created: 2021-05-14 23:56:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 22cec1c4c0c4b4283c5fd7384bf5105c SHA-1: 0c79ae0804f55a14d175472fec03cdb3c43c16c6 SHA-256: 1db4a66bed7d18f333f91046a6c89cbfec0cf49a450886f8c751224bc5b3c6c9
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are SEO-optimized and point to other PDF files, forming a link farm. The primary URL suggests the document is a lure for downloading game-related applications, likely malware. While no scripts were explicitly extracted, the PDF structure and extensive URL farm indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/legitimate-coin-master-free-spins-apk-game-hack PDF link annotation
    • http://krumerhaus.at/images/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/free-shields-coin-master_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/free-mod-apk-coin-master_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/free-attacks-on-coin-master_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/hack-para-coin-master-sin-verification_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/coin-master-free-spins-link-deutsch-ios_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/free-coin-master-gift-link_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://krumerhaus.at/images/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/free-robux-master_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/best-free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://krumerhaus.at/images/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/coin-master-pc-hack-tool_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004989.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4989 24652 bytes
SHA-256: 950feaa74f877a474a21a6072c3d33089d62056fd444b6f21fe4cc92fda0217b
font_01_sfnt_off0000822a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x822A 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BDB 18604 bytes
SHA-256: 744d2d183457972f47b0db91107cea2f4bf33f1c8b8b46bcb558057de1b31a04

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