Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4253d8ce53902d…

MALICIOUS

PDF

49.4 KB Created: 2021-06-03 05:31:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 4c6f177de89dcd7b2f6a2ed8208cfe06 SHA-1: f2509d411633a91eb97ec09c651e04e4692464dc SHA-256: 6d4253d8ce53902da7aed1bd29a9760eb41789831eef3c8bb9acf963d3fdaffd
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits malicious behavior by presenting a fake CAPTCHA and a download lure to entice users to click on malicious links. The embedded URLs, such as 'https://netcdn.online/app/406889139/master-coin-free-link-game-hack', are known to lead to redirectors and potentially malware. The document's content and heuristics strongly suggest an attempt to exploit user interaction for malicious purposes, likely leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/406889139/master-coin-free-link-game-hack In PDF document text
    • http://oca.undil.tl/repository/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/worst-client_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-spins-coin-master-2021-no-verification_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-codes_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/cm-spins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-cheat-free_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-33-hack-version-download_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f33.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F33 24540 bytes
SHA-256: 11f8efa12619935e1a92234e9b3ef50bc4cbf22ba173571a1e1d4740ea422b19
font_01_sfnt_off00008767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8767 4092 bytes
SHA-256: 4281d9780c13ac8bc3a2f75754ed2280030b33c6fe1f8a79c1bc994a2692df36
font_02_sfnt_off00009542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9542 2788 bytes
SHA-256: 6fd7c7f447d66842f81aa8cf197935b17f22157d0c7e9f95622df1b5b4ddf530
font_03_sfnt_off00009f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F32 17880 bytes
SHA-256: f325bc51a5f33ec2ea6c889aa635c0e4104002a1859551a05fb0fcec2a10294b

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