Malicious PDF — malware analysis report

Static analysis result for SHA-256 4810bc8ea31bfb26…

MALICIOUS

PDF

34.9 KB Created: 2021-07-06 05:53:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: c7dd0908aca6720dce5d8914447b1791 SHA-1: d98feb798742c0a7fd0aab8eae731353b7d1ca54 SHA-256: 4810bc8ea31bfb26fa5d49543bde65bfc7e44b816e0ba90f50d216fa10d2b0c6
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, employing a 'free generator / game hack' theme to entice users. It contains numerous links to a redirector infrastructure and a link farm of other scam PDFs, indicating a coordinated effort to distribute malicious content. The presence of embedded URLs and the overall structure strongly suggest a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-email-rewards-game-hack In PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-el-tiger-card-free_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-get-free-vip-in-fashion-famous-roblox_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/roblox-catalog-free_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/injet-cheats-roblox_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/village-3-coin-master_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-robux-codes-no-survey-no-download-2021_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-get-free-robux-2021_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_off000031e1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31E1 22828 bytes
SHA-256: 9a2244584948d32074b602176bd7f9805cb1fbb8f8bd64a0317c8b65b7e60b7e
font_01_sfnt_off000064de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64DE 18508 bytes
SHA-256: be70dc984ec234d90e75e5639b12727d51bc5ee300b41734a45a56f830a4a992

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