Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca584cdabdb2ab5…

MALICIOUS

PDF

43.7 KB Created: 2021-06-04 05:12:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 5c97734b191f32d78f2d65d04eb073fc SHA-1: cc5e44cb845227c3d7012aaceec0afe2b4043193 SHA-256: eca584cdabdb2ab599688073eb4dfa18f397a00a76196373e2743cdeba2a2bb8
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 0.9865

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 https://netcdn.online/app/406889139/twitter-coin-master-free-spins-link-game-hack PDF link annotation
    • http://library.acehresearch.org/repository/tiktok-free-video-download_GM835599320.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hack-spins-ios_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-clothes_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/best-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/hack-coin-master-32-mod-apk_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/hack-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-foxy-food_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coinmaster-spin-ml-free_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/robux-generator-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-gold-cards-free_GM406889139.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_004_off00004fb6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FB6 24636 bytes
SHA-256: ffb7a496a54a0446e798f8815a2431da4c16174dd840636a5063220a5502f875
font_01_sfnt_off00008862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8862 18220 bytes
SHA-256: 52ffbd88cc2cac306fe82121e7a954d434fc7a4bd2ad0f2292b5f4c74619d21b

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