Malicious PDF — malware analysis report

Static analysis result for SHA-256 b29e81432970899b…

MALICIOUS

PDF

44.6 KB Created: 2021-05-17 17:17:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ee80b8f7a4aeb85ac8e742f4494abd8a SHA-1: ab7135263e6d9f3384c4a73650d0ffff38b27e8e SHA-256: b29e81432970899b46d3dfa137425d9da8803c91c8a0ac95c7668eac2556637f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains numerous embedded URLs and a link farm, suggesting it is designed to redirect users to malicious content. The presence of a 'ClickFix' heuristic indicates the document likely instructs the user to execute a command or open a file, which is further supported by the document body containing URLs related to game hacks and cheats. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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
  • 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/479516143/wurst-client-1.12-2-game-hack PDF link annotation
    • http://subarulegacy.com/images/free-card-collection-in-coin-master_GM406889139.pdfIn PDF document text
    • http://subarulegacy.com/images/100-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://subarulegacy.com/images/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://subarulegacy.com/images/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://subarulegacy.com/images/coin-master-hack-pc-download_GM406889139.pdfIn PDF document text
    • http://subarulegacy.com/images/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://subarulegacy.com/images/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • http://subarulegacy.com/images/coin-master-hack-2021-app-download_GM406889139.pdfIn PDF document text
    • http://subarulegacy.com/images/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://subarulegacy.com/images/how-to-get-free-coins-and-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://subarulegacy.com/images/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://subarulegacy.com/images/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://subarulegacy.com/images/coin-master-32-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://subarulegacy.com/images/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • http://subarulegacy.com/images/how-to-get-free-coins-in-coin-master-game_GM406889139.pdfIn PDF document text
    • http://subarulegacy.com/images/free-robux-working_GM431946152.pdfIn PDF document text
    • http://subarulegacy.com/images/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • http://subarulegacy.com/images/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://subarulegacy.com/images/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://subarulegacy.com/images/how-to-get-free-robux-no-verification_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_off00004bfc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BFC 28864 bytes
SHA-256: 24f71448f4212327ae702c9117d48f0c1e9122d6cf691a8f86212771356c01d5
font_01_sfnt_off00008cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CFC 18048 bytes
SHA-256: 311fa6a3c8ed3152b86259a6f2b4fd65ad6ae6b737d77785fc3ef6c3d9292616

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