Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ff47dd002d5e08…

MALICIOUS

PDF

36.9 KB Created: 2021-07-04 18:06:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d3a531c6f5af4b207e10848ce6d3bd88 SHA-1: 5d910025dddeb76dae2d5a4b6c0b2c63a629fe03 SHA-256: c7ff47dd002d5e082f805dab92fda0f73f4be3a36c2a4615cc570fd7e6d39df2
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document employs a lure of free game currency and hacks to trick users into clicking malicious links. The document contains numerous links to redirectors and SEO link farms, which in turn host more malicious PDFs. The primary malicious URL identified is http://netcdn.tw/app/406889139/coin-master-daily-free-spins-link-today-2021-game-hack. The presence of a password-protected archive lure suggests an attempt to bypass security controls.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/406889139/coin-master-daily-free-spins-link-today-2021-game-hack In PDF document text
    • https://library.univthamrinaka.com/repository/how-to-hack-unblock-roblox-password_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/roblox-jailbreak-script-hack_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/rosie-hacks-caillous-roblox-account_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/www-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/how-to-hack-slx-roblox_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/get-free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/microsoft-robux_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/how-to-get-free-robux-the-real-way_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/all-roblox-bloxburg-hack-2021_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/roblox-credit-card-hack_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/buy-robux-free-en-espaol_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/how-to-hack-an-account-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/coin-master-free-spin-daily-bonus_GM406889139.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/hack-slash-roblox-id_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
stream_002_off000035fd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35FD 23192 bytes
SHA-256: 29a3d9575f4864b06c3aa469e057305424c290d0accb69c7b45851de3275ab2a
font_01_sfnt_off00006a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A3D 19344 bytes
SHA-256: bda18ad7bc028b2989dfdc10c84b9c87c1dbf0242a88a3a6fbf9217f203e509c

Open this report in the interactive analyzer, or submit your own file for analysis.