Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a66a7a0a1d8821…

MALICIOUS

PDF

43.4 KB Created: 2021-05-10 23:50:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 3c927bbd6d1e19bf86842d136f751b51 SHA-1: fed876e9158e8e3a11aaf9bd5b90301530313981 SHA-256: 77a66a7a0a1d88214b3a37c793f68144644062a1f9fc782815e0ff33b1436741
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one pointing to a known malicious redirector infrastructure. The document body and heuristics indicate a lure for a 'game hack' or 'free Robux', designed to trick users into clicking the malicious link. The primary link identified is https://netcdn.xyz/app/431946152/how-to-get-unlimited-robux-2021-game-hack, which likely leads to further malicious content or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://netcdn.xyz/app/431946152/how-to-get-unlimited-robux-2021-game-hack In PDF document text
    • http://huebner-baustoffe.de/images/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/roblox-free-wings_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-robux-download_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/get-more-robux_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/how-to-hack-mcpe-master-coins_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/coin-master-mod-free-download_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-roblox-intros_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-minecraft-account-and-password-2021_GM479516143.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/how-to-get-more-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/synapse-roblox-free_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/free-roblox-followers_GM431946152.pdfIn PDF document text
    • http://huebner-baustoffe.de/images/coin-master-apk-hack-3527_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_off00004848.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4848 25704 bytes
SHA-256: 7624a6f62f83725328f505beddbc7e437a431d41bc0d56643edd531b3942f912
font_01_sfnt_off000083e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83E0 19336 bytes
SHA-256: 1d788979998456612fc8aa94ab3a8f98716d71a7de86621e0b208fb5420da083

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