Malicious PDF — malware analysis report

Static analysis result for SHA-256 487617b6638e22a2…

MALICIOUS

PDF

34.2 KB Created: 2021-07-01 07:29:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 238934dff7e7a9640edfad6c6f270c5b SHA-1: 1067e2544c06a53fc39db80c323ff60ba7201675 SHA-256: 487617b6638e22a2fbf3162980fdc712fb4e0d6c59e4c13e768252863b5dcc4c
102 Risk Score

Malware Insights

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

The PDF document contains a link farm designed to lure users with promises of free in-game currency and items for Roblox. The document itself is generated by wkhtmltopdf and contains numerous embedded URLs pointing to other PDFs, likely serving as a SEO spam or phishing lure. The ML classifier strongly indicated maliciousness, and the presence of a download button lure reinforces the deceptive nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/free-hair-on-roblox-2021-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id/repository/roblox-coins-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-rs-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-coins-and-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/cheat-codes-for-roblox-on-the-games_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-run-roblox-hack-script_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-robux-no-human-verification-20212021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/all-of-the-hairs-that-are-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-promocodes-hack-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-cod-style-games-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-game-packs-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-robux-hack-apk-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-promo-codes-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-bobux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-roblox-treasure-hunt-app_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/assassin-2-hack-roblox_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
font_00_sfnt_off00003262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3262 21156 bytes
SHA-256: dce438edb1343070b69de59b5df7ca2008cfd9dcda83ed8fb541d9f01a98bb81
font_01_sfnt_off0000602e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x602E 19172 bytes
SHA-256: 96b0f3be80623e60bc7ad2fa4bff2d2cb2b3573a5acb9ab7e528b5b4a4d2de1e

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