Malicious PDF — malware analysis report

Static analysis result for SHA-256 8135625a38aefe1d…

MALICIOUS

PDF

43.0 KB Created: 2021-05-12 01:03:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5a54a5d7e1f8588570821f533a563b18 SHA-1: 7abad6296b059f64dd57f3894e5cc1f5bca93d66 SHA-256: 8135625a38aefe1dd1100ca3c6a3f1a67497cb6740f944933dd77ac837e8b093
140 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link to known malicious redirector infrastructure, which is likely used to deliver a second-stage payload. The document body and heuristics suggest a social engineering lure, specifically a 'ClickFix' attack, attempting to trick the user into executing a command to bypass security measures and download a file. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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
  • 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/479516143/minecraft-pe-0.16-0-apk-download-free-game-hack In PDF document text
    • http://vostokbg.ru/images/ac-market-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://vostokbg.ru/images/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://vostokbg.ru/images/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://vostokbg.ru/images/roblox-redeem-card-codes-free_GM431946152.pdfIn PDF document text
    • http://vostokbg.ru/images/haktuts-free-spins_GM406889139.pdfIn PDF document text
    • http://vostokbg.ru/images/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://vostokbg.ru/images/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://vostokbg.ru/images/watch-videos-for-robux_GM431946152.pdfIn PDF document text
    • http://vostokbg.ru/images/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • http://vostokbg.ru/images/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://vostokbg.ru/images/get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://vostokbg.ru/images/free-minecraft-skin-maker_GM479516143.pdfIn PDF document text
    • http://vostokbg.ru/images/get-robux_GM431946152.pdfIn PDF document text
    • http://vostokbg.ru/images/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://vostokbg.ru/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://vostokbg.ru/images/coin-master-free-spins-iphone-2021_GM406889139.pdfIn PDF document text
    • http://vostokbg.ru/images/free-coin-spin-daily-link-net_GM406889139.pdfIn PDF document text
    • http://vostokbg.ru/images/coin-master-game-free-play-online_GM406889139.pdfIn PDF document text
    • http://vostokbg.ru/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://vostokbg.ru/images/coin-master-daily-free-spins-hack_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_off00004a60.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A60 24932 bytes
SHA-256: 7033c2acbbc6e4b3ffb05e87ab80b588cb090848bb74f3b1e52dc1d5ef6f29cd
font_01_sfnt_off000082b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82B8 19300 bytes
SHA-256: 520ea12fa60618e22dfb92575853af2f045fc875098f6a67670d45663928019c

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