Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2cafe49967855de…

MALICIOUS

PDF

34.2 KB Created: 2021-06-26 14:42:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 70faa8b6a4b6f56ab6259f79948d6c0c SHA-1: 9730a4d62748b3e619486604e6f582500131c1bf SHA-256: b2cafe49967855dee950505977eb2860f824c8c7ec4c8a405b2a8b87f654f127
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains multiple links to a known malicious redirector infrastructure, disguised as a 'free generator' or 'game hack'. The document body explicitly mentions 'how to get free robux' and includes the malicious URL, indicating a social engineering lure to drive traffic to potentially harmful sites. No scripts were extracted, but the presence of malicious links and the lure strongly suggest a phishing or scam attempt.

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-get-free-robux-from-a-game-game-hack In PDF document text
    • http://elibrary.fl.unud.ac.id/repository/minecraft-pe-free-download-ios_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-hack-robux-with-inspect-element-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-admin-thumbnail-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-toys-codes-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/how-to-get-free-16-bit-in-roblox-skywars_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/minecraft-pe-free-ios_GM479516143.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-heaven-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-accessories-in-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/hack-exploit-for-roblox-no-virus_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-free-coins-and-spins-group_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/roblox-bc-free-codes-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/a-hack-to-open-the-applications-on-roblox-got-talent_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-get-roblox-credit-for-free_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-coin-spin-daily-link-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/abstact-free-version-roblox-exploit_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/spin-and-coin_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-minecraft-coloring-pages_GM479516143.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_off00003029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3029 21716 bytes
SHA-256: 8024d4413a5b7098d056a923608aeeb2d6f160ddbeda20dd689bb38a71e36f57
font_01_sfnt_off00005fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEA 19244 bytes
SHA-256: 0fc3743b296c51bca7478094f286f0570d2e1548091698a712d008fbfc51e120

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