Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d85e05505bc69e4…

MALICIOUS

PDF

34.6 KB Created: 2021-07-09 03:23:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: b8c4b4007bb173c7048e2fab652358fa SHA-1: 6e8fcc3897f156c42fb73019360bc271a50b4dad SHA-256: 9d85e05505bc69e4a4deed2e941dcdedaf72d3004f14826b0cc00b765aa6ff6d
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including one pointing to a known malicious redirector infrastructure at http://netcdn.tw/app/431946152/rbx-gg-free-robux-game-hack. The document body and heuristics indicate a lure for game hacks and free currency, suggesting a phishing or scam attempt. The presence of multiple links to external PDFs, some with numeric slugs, indicates a link farm designed to attract traffic.

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/431946152/rbx-gg-free-robux-game-hack In PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/pubg-uc-2021_GM1330123889.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/robux-hack-download-google-chrome_GM431946152.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/complete-an-action-for-free-robux_GM431946152.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/free-old-roblox-accounts-pastebin_GM431946152.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/free-minecraft-java-edition-codes_GM479516143.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/coinmaster-spin-ml_GM406889139.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/roblox-game-hack-tool-download_GM431946152.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/free-spins-coin-master-legit_GM406889139.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/robux-2021_GM431946152.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/pants-roblox-free_GM431946152.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/robux-hack-deutsch-youtube_GM431946152.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/can-i-hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/free-robux-with-only-username_GM431946152.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/how-do-i-hack-robux-by-myself_GM431946152.pdfIn PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/how-to-get-free-robux-inspect_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_off0000316a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x316A 22320 bytes
SHA-256: d3276ac67f901ba382109dbff9de9584307aa2cadb3f9a8aea7c247e095fcee4
font_01_sfnt_off00006312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6312 18716 bytes
SHA-256: 5ed4a17f1e1f347672ac707c48d478a4e03b12aa7b666a188f58978ddccfd2a0

Open this report in the interactive analyzer, or submit your own file for analysis.