Malicious PDF — malware analysis report

Static analysis result for SHA-256 c805ea513f83371c…

MALICIOUS

PDF

45.0 KB Created: 2021-06-03 17:42:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4615494029296b4698204587260cd6d5 SHA-1: 769fac3dc66eba33020e29767c9d41b4f6bb672b SHA-256: c805ea513f83371c11dfdcb76f1bc872d09d94d035abbb52dc757456c0d69503
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to game hacks and free generators, as indicated by the 'PDF_GAME_HACK_REDIRECT_LURE' heuristic and the document body content. It contains multiple embedded URLs pointing to potentially malicious redirectors, such as 'https://netcdn.online/app/431946152/roblox-cheat-codes-game-hack'. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests that the document may be part of a multi-stage attack where a password-protected archive is involved, likely to evade initial security checks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • 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 https://netcdn.online/app/431946152/roblox-cheat-codes-game-hack In PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-roblox-animations_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spins-no-verification_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/pubg-uc-zarah_GM1330123889.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-daily-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-coins-and-spins-online-tool_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/freespinandcoin-blogspot_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
stream_004_off000051ab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51AB 25268 bytes
SHA-256: c6baf8c5ec3f193002cb46b02c02db4e2665b48b07152970d3271e6cc6c32db8
font_01_sfnt_off00008c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C72 18456 bytes
SHA-256: 79411d0a2da13a8acff975e82d989f343be59a98b2b19e39ed5663a4026c58d6

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