Malicious PDF — malware analysis report

Static analysis result for SHA-256 2afc84f0db62d99f…

MALICIOUS

PDF

34.2 KB Created: 2021-07-06 00:32:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 6d6496760c6e8276287b4d18236fde68 SHA-1: 97e651b9e68d795b2231a38b1169cbfda3eea2e0 SHA-256: 2afc84f0db62d99fe52cf91c46fab25ad2ac1513f8723a22cf351d7996705530
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/free-spins-coin-master-2021-app-game-hack PDF link annotation
    • http://bw.ac.th/userfiles/files/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/haktuts-coin-master-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/hack-coin-master-apk-32_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/coin-master-free-spins-link-2021-no-verification-deutsch_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-robux-works-100_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/roblox-sex-cheat-code_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/pokemon-go-free-daily-spawn_GM1094591345.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/football-legends-hack-roblox_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/how-do-you-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/guuud-info-free-robux_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/how-to-change-your-name-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-spins-coin-master-links-thursday-november-28-2021_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/how-to-change-your-username-on-roblox-for-free-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_off00002f93.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F93 22620 bytes
SHA-256: 9789d0ef23b4c97a6d5fe8c16c1e28e9fe914b2eb68e48f4b2864f5b9cfcd248
font_01_sfnt_off00006207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6207 18576 bytes
SHA-256: 15a675c2e57ed79e3df4794bcfdf733c83ffccf7533f1288849b01a630512951

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