Malicious PDF — malware analysis report

Static analysis result for SHA-256 be641b4b65d99b85…

MALICIOUS

PDF

34.6 KB Created: 2021-06-28 02:46:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 58cba310ac0f3846ae7a3e1b870e66ff SHA-1: 6bf6dd996799232f753694c8edb5c600cc1f2937 SHA-256: be641b4b65d99b859c570d8006e7fdef9c25e82ed70c29b2853f29bd0c587cb8
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of game hacks and free currency to trick users into clicking malicious links. It contains numerous links to external PDF files, likely part of a link farm, and a primary redirector URL. The document's structure and embedded links strongly suggest a phishing or scam campaign aimed at driving traffic to potentially harmful sites.

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.
  • 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.
  • 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.co/app/431946152/how-to-hack-roblox-for-robux-2021-game-hack In PDF document text
    • https://sunnygarden.com.tw/image/data/files/wurst-client-18-9_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/toolbox-for-minecraft-pe-ios_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/freespincoin-masterlinkdownload_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/hack-para-roblox-prision-life-armas-admin_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-spins-generator_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-spin-and-trading_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-spins-and-coins-haktuts_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/casper-hack-roblox-jailbreak-noclip_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/google-roblox-games_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/minecraft-pocket-edition-free-download_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-robux-net_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/best-free-server-side-exploits-for-roblox_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-amby-hack_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/send-me-500-2021-spins_GM406889139.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_off00003030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3030 22032 bytes
SHA-256: 6e30d9f68533dda2e2c5ac2639ff6dd63fe922f0bc614b8457c7649380a2dd19
font_01_sfnt_off000060d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60D4 19528 bytes
SHA-256: 7c3a2f60f5e5baa487ca42c3c93d51da1f2c0b6e1c89830aeaa44680603f888e

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