Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db79fafe18b192f…

MALICIOUS

PDF

34.4 KB Created: 2021-07-03 15:32:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 3137a61e51fa5bd6c9992911f06e1ab9 SHA-1: 84865d4c7f630e49ab0d742bc0aae708704b4a09 SHA-256: 3db79fafe18b192ffe7018629952c3725fef136e965cd5a37989fe26cfabbf40
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.tw/app/406889139/how-to-hack-coin-master-game-game-hack PDF link annotation
    • http://digilib-unirow.ac.id/repository/coin-master-hacked-apk-download-for-android_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/roblox-spieler-hacken_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/unlimited-spin-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/tiktok-free-to-use_GM835599320.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-minecraft-server-hosting-with-plugins_GM479516143.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/hack-roblox-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-robux-obby_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/hack-coin-master-game-apk_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/www-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-roblox-executor-no-key_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/google-how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/www-robux_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/roblox-dino-sim-duplicate-hacks_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-roblox-accounts-with-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
stream_002_off0000303b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x303B 22888 bytes
SHA-256: 7bfcebe17fd961094e8db5becc914c235e7e87a529f03ff9c0fe91a8e3273989
font_01_sfnt_off0000637d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x637D 18428 bytes
SHA-256: 1b515550e836c22b85926dfb42e46c30c9e7b75c78fcc864c57374ff32ab1983

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