Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ecdbf84b9f976a…

MALICIOUS

PDF

33.2 KB Created: 2021-06-27 16:49:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 2683404139e617826ba2f89b991277ec SHA-1: 0ff3dc22a8ca4ed0d27fad196af78d56f4e5f976 SHA-256: 28ecdbf84b9f976a1949a6819f9779bf200c17b7b602770c819d51801cdfee6f
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links disguised as game-related content, such as 'Roblox Shionbi Life Max Lvl Hack'. One critical heuristic identified a link to a known malicious redirector infrastructure, suggesting the document is designed to funnel users to malicious sites. The presence of a 'password-protected archive lure' heuristic indicates a common tactic to bypass security scanning by encrypting the actual payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/roblox-shionbi-life-max-lvl-hack-robloxdaily-game-hack In PDF document text
    • https://library.iuli.ac.id/repository/free-code-that-give-robux-giveaway_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-account-in-roblox-obc_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/roblox-robux-hack-2021-pc_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/link-coin-master_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/https-iosgodscom-topic-20214coinmasterhack_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-find-free-items-in-roblox-catalog_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-hack-a-roblox-account-with-editthiscookie_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-get-free-unlimited-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/roblox-obby-free-robux-no-password_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-get-your-roblox-account-back-from-being-hacked_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/roblox-supreme-free_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/unpatched-cheat-engine-roblox-2021-february_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-get-free-robux-really-fast_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-rthro-roblox_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-get-hacks-for-prison-life-roblox_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_off00002bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BB2 21708 bytes
SHA-256: 57aa111470e964a2b333f72ed38005a72adb8a5384396a33726f6c66eb11c218
font_01_sfnt_off00005b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B7B 19608 bytes
SHA-256: 2753702565aac65cdca3ccd6cfde97c74bbe9e385848de82ac22934257ecf0b7

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