Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a368ef13d048463…

MALICIOUS

PDF

34.6 KB Created: 2021-06-25 20:28:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1843f925155f294c3c70419ca435bce8 SHA-1: 276e55ab12ae6d79f9e9e23c353ad6602b2c3780 SHA-256: 0a368ef13d048463095751b1a127a981187752cfb2d4bee2ff17e9c47267910c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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/479516143/minecraft-building-hacks-game-hack PDF link annotation
    • http://gts.edu.gh/library/repository/roblox-get-free-robux-obby_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/game-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-roblox-com_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-spins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-how-to-get-robux-free-no-hack_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-is-tiktok-free_GM835599320.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-get-free-roebucks-without-verification_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-get-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-get-the-snowman-package-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-ohne-handynummer-und-menschliche-ver_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/tiktok-free-iphone-12_GM835599320.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-gift-card-generator_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_off000031c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C0 22444 bytes
SHA-256: ff7f76a43082f88d6f1eb8934b316807d73458b6e1046d9c984365eef179c9c8
font_01_sfnt_off000063e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E8 18628 bytes
SHA-256: 03be4b6b10a4c687c6c89c16a3bf013511456428a76c01e3ee63370f4522cf94

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