Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3cc37069c6b4516…

MALICIOUS

PDF

33.9 KB Created: 2021-07-08 05:25:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 9fb2d4288325e4a80ad05b1eb7491039 SHA-1: 0542712a76ccf6555a374a3fbf695d316c43fcf9 SHA-256: e3cc37069c6b4516f80e5ef1b76b0559ff5c525d2e4af9411133ae02548d68f1
260 Risk Score

Malware Insights

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

This PDF document employs social engineering tactics, presenting a fake CAPTCHA and download prompts to trick users into clicking malicious links. The primary link directs to a known malicious redirector infrastructure, which likely serves as a gateway to further malicious content or exploits. The document also contains a large number of SEO-optimized links pointing to other PDF files, suggesting a link farm designed to improve search engine rankings for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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.
  • 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
  • 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/minecraft-free-android-game-hack In PDF document text
    • https://www.sarsen.net/uploads/files/files/roblox-jailbreak-hack-application-easy_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-free-100-spin-link_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-get-free-robux-without-human-verification-or-email_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/robloxbuddy-me-free-robux_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-minecraft-mods-for-pc_GM479516143.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/roblox-grand-blox-auto-money-cheat_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/get-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/roblox-free-cool-clothes_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/roblox-vehicle-simulator-money-hack-cheat-engine_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/minecraft-hacks-xbox_GM479516143.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-cheat-on-bear-roblox_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_off00002fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FB6 22632 bytes
SHA-256: ac39d64cb9ee8d23181aa7a0f6fd81755b1776f3fb8ebb152837f18e6c71626c
font_01_sfnt_off00006243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6243 18172 bytes
SHA-256: 76a46b6ffa672d4629705b025ed1d2900a12de91bcde6df1b9c7209dc48d6afd

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