Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b7d68801553626…

MALICIOUS

PDF

34.0 KB Created: 2021-06-19 06:39:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: c6c51000de84effaabbe32ff1ebca4d3 SHA-1: 301e58160c162bbbb5ff6c6b6c62a7077e61e128 SHA-256: 71b7d68801553626ccdc5035e4e42de920f36bcb8250856459011c09ec51851b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links, including one pointing to 'netcdn.co', which is flagged as a malicious redirector. The document body and extracted links suggest a lure for game hacks or cheats, likely to deliver a secondary payload or phish for credentials. The ML classifier also strongly indicated maliciousness.

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/hack-vehicle-sim-roblox-game-hack In PDF document text
    • https://bwsrubber.com/image/data/files/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/free-robux-working_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/wurst-112-2_GM479516143.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/redline-roblox-hack_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/coin-master-hack-game-download-ios_GM406889139.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/free-unused-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/robux-free-com_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/roblox-hack-com_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/robuxglobalcom_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/minecraft-windows-10-free-code_GM479516143.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/coin-master-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/easy-way-to-get-robux_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_off00002f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F63 21644 bytes
SHA-256: 36532168db4f6534592bd3f7a440438f92951e5076dd844a12e3c37ac49484cf
font_01_sfnt_off00005ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF2 19336 bytes
SHA-256: cc200b35c37a45d9338bbadb7827380dbcad94776f4eabee47b002ccf6c7feb3

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