Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5a1003805aec4f…

MALICIOUS

PDF

34.7 KB Created: 2021-07-08 23:11:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8a3251f5cfd2e95c63e1c9e5840c8d54 SHA-1: 1ff9195d88a7eb7ac06d87e5b97ac4ccd7191b83 SHA-256: 1a5a1003805aec4f4c198a0b9b69c77e61fd020449f5401ad19b23b62a120e89
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links disguised as generators or hacks for popular games, such as Coin Master and Roblox. One prominent link, http://netcdn.tw/app/406889139/coin-master-spin-link-today-game-hack, is identified as a known malicious redirector. The document body and heuristics indicate a lure to download or visit these sites, which likely host further malicious content or phishing pages. The use of an IP address literal in a URL also indicates suspicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • 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/coin-master-spin-link-today-game-hack In PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/coin-master-hack-root_GM406889139.pdfPDF link annotation
    • http://103.19.59.42/__statics/gudangsoal/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/free-stuff-for-your-avatar-on-roblox_GM431946152.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/how-to-get-coin-master-card-free_GM406889139.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/rbx-sites_GM431946152.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/how-to-change-your-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/how-to-get-free-shirts-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/free-spins-coin-master-links-app_GM406889139.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/robux-generator-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/free-spin-link_GM406889139.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/free-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/free-roblox-cards-survey_GM431946152.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/minecraft-pocket-edition-apk-free-download_GM479516143.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/free-robux-hack-no-verification_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_off00003152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3152 22780 bytes
SHA-256: 4211b5c5475bf4bafcdd8959c76db154a2322dcbcb6c02a2bd74be43e4086a53
font_01_sfnt_off00006425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6425 18536 bytes
SHA-256: 232cb4b515db04c7b0e85e36ce0db153ce2fb992ec8f88a884e5f1f80d4c2854

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