Malicious PDF — malware analysis report

Static analysis result for SHA-256 769297f13786f789…

MALICIOUS

PDF

49.2 KB Created: 2021-06-04 04:44:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5119499ad3bf5070e083aa6cb224c1b5 SHA-1: a3a610925de1be18b362df2014d99f367c811acd SHA-256: 769297f13786f7895194b66831f100bfe8f24deb7844cc9b36cccb2a7bffc141
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9796

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/431946152/how-to-get-free-robux-ez-ways-game-hack PDF link annotation
    • http://lib.kesdammedan.ac.id/repository/spin-link_GM406889139.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id//repository/how-to-become-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id//repository/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id//repository/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/free-coin-spin-daily-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id//repository/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/coin-master-free-spins-app-android_GM406889139.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/how-to-hack-coin-master-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/can-i-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/tiktok-likes-for-free_GM835599320.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/how-to-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id//repository/minecraft-bedrock-download-pc-free_GM479516143.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id//repository/whats-robux_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id//repository/minecraft-free-computer-game_GM479516143.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/free-coin-master-gift-link_GM406889139.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id//repository/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.communes.comIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51A5 28304 bytes
SHA-256: 67c42c016d302235104f2f71cea9f4cc43f83c1c8fb631c76e11a0407a1d3085
font_01_sfnt_off000091e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91E6 2820 bytes
SHA-256: e5f6ec650849eefe6bc6a1649c2875ce35328d23e4196945bba66cc43e5a49d4
font_02_sfnt_off00009b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B85 18968 bytes
SHA-256: c730a2bc814502d73b4b22e821d5320d696aedfd9f36a97d18c9400494035639

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