Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cffb2b462be697b…

MALICIOUS

PDF

34.9 KB Created: 2021-07-04 05:11:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 93387cc60b94ff4e005c141a8ff23412 SHA-1: 3349178a730e64327c70ce9513ae6adde87dd54f SHA-256: 4cffb2b462be697b3bac3ff4317cb46e11aa067e2634a6b2de0ebc4a6b8ad0f9
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/hack-para-coin-master-singapore-game-hack PDF link annotation
    • http://www.arichuna.com/images/files/minecraft-iphone-free_GM479516143.pdfIn PDF document text
    • http://www.arichuna.com/images/files/how-to-get-tiktok-famous-free_GM835599320.pdfIn PDF document text
    • http://www.arichuna.com/images/files/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://www.arichuna.com/images/files/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • http://www.arichuna.com/images/files/code-how-to-get-2021-free-crystals-roblox-skybound-2_GM431946152.pdfIn PDF document text
    • http://www.arichuna.com/images/files/robux-hack-apk-download-without-generator_GM431946152.pdfIn PDF document text
    • http://www.arichuna.com/images/files/do-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://www.arichuna.com/images/files/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://www.arichuna.com/images/files/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.arichuna.com/images/files/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • http://www.arichuna.com/images/files/coin-master-hack-here_GM406889139.pdfIn PDF document text
    • http://www.arichuna.com/images/files/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.arichuna.com/images/files/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.arichuna.com/images/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.arichuna.com/images/files/how-to-vote-kick-on-free-draw-roblox_GM431946152.pdfIn PDF document text
    • http://www.arichuna.com/images/files/free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://www.arichuna.com/images/files/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.arichuna.com/images/files/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.arichuna.com/images/files/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://www.arichuna.com/images/files/minecraft-texture-packs-free-download_GM479516143.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_off00003329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3329 22512 bytes
SHA-256: a12c9b19e36df2cdc910691abec8ee7a43ccb92f0a2bc75a7620a736de50009e
font_01_sfnt_off00006561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6561 18332 bytes
SHA-256: 7a06b268a0635f8a5522d84c5da66ca6895134d44174cfdc6223da1b32f7b83a

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