Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a84eeb77c43a76…

MALICIOUS

PDF

43.6 KB Created: 2021-06-08 14:04:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 26ff217041adf2d00a1bbb152d96ff20 SHA-1: f6be3203301824414b79e2491601f479ace24c58 SHA-256: 39a84eeb77c43a76d2334d492521ad21114fd0042cac0163cea606b45711ef86
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which are part of a link farm, suggesting a tactic to artificially boost search engine rankings or distribute malicious content. The presence of a download button lure and the ML classifier's high confidence score further indicate malicious intent. The document's content and embedded URLs point towards a scam or phishing attempt, likely aiming to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/how-to-get-free-robux-on-xbox-game-hack PDF link annotation
    • http://xn--80aciiv6azczc.xn--p1ai/images/coin-master-gold-cards-free-link_GM406889139.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/how-to-get-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/free-tiktok-followers-no-downloads_GM835599320.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/pubg-hack-uc-20219_GM1330123889.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/toolbox-for-minecraft-pe-ios_GM479516143.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/pubg-uc-kharidna-hai_GM1330123889.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/static-moonactive_GM406889139.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/free-roblox-clothes-for-your-avatar_GM431946152.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/roblox-com-free-play_GM431946152.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/how-do-i-use-hacks-in-roblox_GM431946152.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/how-to-download-wurst_GM479516143.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/roblox-hacks-2021-free-robux_GM431946152.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://xn--80aciiv6azczc.xn--p1ai/images/coin-master-ultra-attack-hack_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004ea4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EA4 24756 bytes
SHA-256: 54d73e287445a09ec102b82db26d769c3bf64778fc84ec2f62ff241de73bb513
font_01_sfnt_off00008798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8798 18280 bytes
SHA-256: a714055d707ba6f211dbd2ca9ac15eb10152543cecc7f0285658f747ebe0b55a

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