Malicious PDF — malware analysis report

Static analysis result for SHA-256 614cf9951fe2541c…

MALICIOUS

PDF

43.2 KB Created: 2021-06-14 01:40:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d55db584556f74173a7471a6a493895b SHA-1: e0b44c1b23647f970ae5c72b804b6c53027faa30 SHA-256: 614cf9951fe2541cfe1f10edb26f8397b49c350d84d3b79c20398bb9d6151a0c
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure, disguised as game hacks and free item generators. The document body and heuristics indicate a lure to download or access potentially harmful content. While no scripts were explicitly extracted, the nature of the links and the 'password-protected archive' heuristic suggest a workflow designed to bypass security controls and deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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-ninja-assassin-hack-script-game-hack In PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-hack-sin-verificacion-humana_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-kill-aura-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/funny-roblox-free-t-shirts_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/crop-tops-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/vehicle-simulator-roblox-money-cheat_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-roblox-wings_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-minecraft-mods-for-pc_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-roblox-without-downloading-games_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/script-cheat-roblox-mad-city_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/apk-coin-master-hack_GM406889139.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_off00004921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4921 25504 bytes
SHA-256: 548697e5b3b659abcc959260b6db7eab80cc12791d7e0f860e29442e5c1c3c67
font_01_sfnt_off00008486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8486 18956 bytes
SHA-256: ef4df268c6477a7f89f3c1ab07aa51288509e0e5e7c93aedceb1110267f5189c

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