Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0dac850f9518a0…

MALICIOUS

PDF

50.8 KB Created: 2021-06-03 14:09:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1fcca53030941dcbaa819a10fda199d9 SHA-1: 79bc6471683b6036ea3d0e7c007272b03c3ad00e SHA-256: ef0dac850f9518a001eeeb947403273d92c374f48a3364194041f8c2e83b3f93
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are identified as malicious redirectors or part of a link farm designed for SEO manipulation. The document body and embedded links promote 'game hacks' and 'free generators', indicating a social engineering lure to trick users into visiting potentially harmful sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9713

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 https://netcdn.online/app/406889139/coin-master-pc-game-free-download-game-hack In PDF document text
    • https://lib.unitri.ac.id/repository/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-unlimited-spins_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/online-hacking-tricks-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/are-there-any-coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/robloxfun-com-generator_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/robux-generator-no-verification-needed_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-cheat-to-get-free-spins_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-hack-tool-download_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-tik-tok-quiz_GM835599320.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-free_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/get-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f91.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F91 26116 bytes
SHA-256: f0828c5302b9a9721efae9db4a0205c3e8ace2a4e2e28eb2ceadf7c3492d2aff
font_01_sfnt_off00008adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ADF 4028 bytes
SHA-256: 6a4891da4f8b73c02e22ecd6fa566d6bb4f5f2d5575b30a343f3d3c5e0919267
font_02_sfnt_off00009882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9882 2788 bytes
SHA-256: 6fd7c7f447d66842f81aa8cf197935b17f22157d0c7e9f95622df1b5b4ddf530
font_03_sfnt_off0000a272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA272 18704 bytes
SHA-256: 8ce66c65e478767476711e8a187d609ec807e2903d8f7500c3ed78d36e0717ab

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