Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be98e8057843a8a…

MALICIOUS

PDF

33.1 KB Created: 2021-07-03 17:43:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9390113a1e40b315585d2785d09da1a1 SHA-1: 4eccdf73ed24fe21136545dd8c3cfa42e1cb5620 SHA-256: 4be98e8057843a8af3bbb6bb0db5a086cd9ff228ca2587ab01c71c214014b507
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a link farm strategy, presenting lures such as fake CAPTCHAs and download buttons to trick users into clicking on external URLs. These URLs lead to sites offering game hacks and free currency, which are likely pretexts for delivering malicious payloads. The ML classifier strongly indicated maliciousness, and the document's structure suggests it's part of a broader SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/479516143/best-minecraft-hacked-client-game-hack PDF link annotation
    • http://lib.akpnbahtera.ac.id/repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/coin-master-hack-tool-pc_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/whats-robux_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/coin-master-hack-app-2021-download_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/how-to-make-robux-fast-and-free_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/android-1-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/coin-master-hack-apk-link_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/super-power-training-simulator-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/roblox-catalog-hacks-thumbnail_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/roblox-free-clothes-generator_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/how-to-get-robux-games-for-free_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/how-can-you-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/easy-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/roblox-redeem_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/roblox-legendary-football-vip-server-free_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_off00002d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D83 22052 bytes
SHA-256: 4829bc488dc72d8107bd942822d4bfe746f511d8e72b62dbb6781977800d2f8f
font_01_sfnt_off00005e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E37 18492 bytes
SHA-256: 86296843b88eed25728c8cc075b43780ca1cc7c9d5e807804b99454961e5616a

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