Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bc3bd2c957108e…

MALICIOUS

PDF

33.7 KB Created: 2021-07-03 13:01:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 37a86ff03b066f72fc356aad615d523b SHA-1: d5ec4610fb78da912bf70b3c732598a355e84725 SHA-256: 55bc3bd2c957108e0ec9b022e7195bdb58c9c2ebbdbc187eb69b30add7ff7aa1
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document contains numerous links, including one pointing to a known malicious redirector infrastructure at http://netcdn.tw/app/431946152/roblox-pics-game-hack. The document body and heuristics indicate a lure related to game hacks and free generators, suggesting a phishing or malware distribution attempt. The presence of a large number of external links, many with SEO-like slugs, points towards a link farm strategy to distribute malicious content.

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/roblox-pics-game-hack In PDF document text
    • https://library.iuli.ac.id/repository/free-minecraft-realms-to-join_GM479516143.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/john-doe-hacked-roblox_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/como-hackear-robux-en-meepcity_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/coin-master-free-spins-link-june-2021_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/easy-robux-hack_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/download-coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-ro-get-free-robux-just-by-using-a-hat_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-use-cheat-engine-on-roblox-retail-tycoon_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-spins-october-28-2021-coin-master_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/roblox-shinobi-life-cheat-engine_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/roblox-cheat-jailbreak-2021_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/roblox-20-package-for-free_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/blogspot-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-get-faces-that-cost-robux-in-roblox-free_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/this-app-gives-you-free-robux-yt_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-get-free-robux-on-pc_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_off00002dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DBA 22356 bytes
SHA-256: 12955de2a4111d7c10e1b955da43136115211fa8549faa730f77ed0d5dfd1f5b
font_01_sfnt_off00005f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F6E 18760 bytes
SHA-256: 4b095f4b8887294ffd8970da978281d8a745c5c5e0b2658ea64b9d3d0d40b151

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