Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e1d3a84d622d95…

MALICIOUS

PDF

34.7 KB Created: 2021-06-30 07:28:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4b8a689732be71b2e77278eaf70f5a34 SHA-1: 38c39edb1cc5f9e7e45f50137db4de606ab94afe SHA-256: d9e1d3a84d622d95ca52a9fc1e344be3b29e06a92c72cce81e9365d2a7de7cca
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/431946152/codes-to-get-free-items-on-roblox-game-hack PDF link annotation
    • http://library.ulb.ac.id//repository/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/is-roblox-free-on-xbox-1_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/hacks-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/can-i-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-spins-for-iphone_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-tiktok-coins_GM835599320.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-shirt-free-blue_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/hack-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-without-survey-or-verification_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-roblox-account-dump-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/bit-slicer-speed-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/links-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-tik-tok-quiz_GM835599320.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-2021-control-panel_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-stop-attack-hack_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-jacket-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-do-you-get-free-robux-2021_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_off000030f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30F2 22096 bytes
SHA-256: 8066948acee47027628e98bf18a51e2a46e4750bdd7219917e3e3d18af455640
font_01_sfnt_off00006221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6221 19188 bytes
SHA-256: 9d6aa399d9affb2d31722eec5ad8f968fb46f2ea429a36be32aa8118ef1deaec

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