Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c61cf803b5cee9…

MALICIOUS

PDF

35.8 KB Created: 2021-07-01 04:09:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d36072978e52eef777a6fde7badb6482 SHA-1: 91fc748ecef4cb00b7e0168620a27dbcc48a28a7 SHA-256: d3c61cf803b5cee91f24ded954fedf2f50fb34117cd39dbea7711dc7bf948bd7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure related to 'free Robux' for Roblox, directing users to a malicious URL. This URL is flagged as a known malicious redirector, indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be a deceptive link within the document body.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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-cheat-robux-in-roblox-2021-game-hack In PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-no-nothing_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/download-coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-data-breach_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/where-is-the-hacking-station-clone-tycoon-2-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-robux-page_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/minecraft-clipart-free_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/all-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-server-shutdown-hack_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-coin-master-links_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_off000032e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32E0 22764 bytes
SHA-256: 33f7bf9a9e293dfbd7e26ed7163dfd19fd438f7505bcddf1f4bcf1d67ace347b
font_01_sfnt_off00006594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6594 19464 bytes
SHA-256: 36ac185aa2e6096528cc000a7f5bd1e21ba0b6ba43a0e2c2d463d4e637a73610

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