Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c524c5af5c601b…

MALICIOUS

PDF

43.1 KB Created: 2021-05-11 06:33:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d9b8c4dfe439b6f4745709dbe2f25d12 SHA-1: 6aac9ca2ae55bf1264a556f03e103407d160c09c SHA-256: 11c524c5af5c601be80acd8d158220759cdd94bc031d370abb7257569d634dad
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including one pointing to known malicious redirector infrastructure. The document body and embedded links suggest a lure for game-related cheats or currency, likely leading to a phishing or malware download site. The presence of multiple redirector links and the ML classifier's high confidence score indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/431946152/earn-robux-sites-game-hack In PDF document text
    • http://picuruta.com.br/images/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://picuruta.com.br/images/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdfIn PDF document text
    • http://picuruta.com.br/images/coin-master-unlimited-spins-apk-free-download_GM406889139.pdfIn PDF document text
    • http://picuruta.com.br/images/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://picuruta.com.br/images/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://picuruta.com.br/images/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://picuruta.com.br/images/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://picuruta.com.br/images/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • http://picuruta.com.br/images/roblox-g_GM431946152.pdfIn PDF document text
    • http://picuruta.com.br/images/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://picuruta.com.br/images/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://picuruta.com.br/images/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://picuruta.com.br/images/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://picuruta.com.br/images/coin-master-cheat-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://picuruta.com.br/images/minecraft-beta-free_GM479516143.pdfIn PDF document text
    • http://picuruta.com.br/images/free-spins-and-coins-from-coin-master-game_GM406889139.pdfIn PDF document text
    • http://picuruta.com.br/images/coin-master-free-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://picuruta.com.br/images/how-to-get-free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://picuruta.com.br/images/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://picuruta.com.br/images/flip-master-coins-hack_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
stream_003_off00004ab0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AB0 25508 bytes
SHA-256: c65e4ca3799d98994be29a3855ffb1a52c8f223a19b2dc485278af4ec7c7f29c
font_01_sfnt_off00008604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8604 18300 bytes
SHA-256: 9e3af24e52ef4cb9fc4b51a762cd65285bc4813e2d9c15cd1a5337b0fae4df73

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