Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5509a4b8e88ccc0…

MALICIOUS

PDF

41.0 KB Created: 2021-05-12 11:34:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2a163084c72d01067cbda1f9100fd4b1 SHA-1: c2db88db242ebf3ac3763082d403b49744404114 SHA-256: d5509a4b8e88ccc09f68766b1833f5a69f4fdc538830471f414da678ea2f51d3
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors, specifically promoting 'game hacks' and 'free spins' for games like Coin Master and Robux. The primary lure appears to be a generator or hack for Coin Master, directing users to the URL https://netcdn.xyz/app/406889139/coin-master-free-spins-16-04-19-game-hack. The presence of numerous similar URLs suggests a campaign distributing these lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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.
  • 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.xyz/app/406889139/coin-master-free-spins-16-04-19-game-hack In PDF document text
    • http://dialine.cz/images/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://dialine.cz/images/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/coin-master-free-spins-link-2021-twitter_GM406889139.pdfIn PDF document text
    • http://dialine.cz/images/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/coin-master-free-spinv1-0apkpure-com-apk_GM406889139.pdfIn PDF document text
    • http://dialine.cz/images/free-coin-master-gold-cards_GM406889139.pdfIn PDF document text
    • http://dialine.cz/images/coin-master-level-4_GM406889139.pdfIn PDF document text
    • http://dialine.cz/images/earn-points-for-robux_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://dialine.cz/images/synapse-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/free-roblox-shirt-templates_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/app-store-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://dialine.cz/images/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/2021-free-spins-coin-master_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_003_off00004464.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4464 24924 bytes
SHA-256: 8ff1da71a722a5cd7833a6ca09a6dc470af4522a807de452a72c2018781a5777
font_01_sfnt_off00007cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF3 18560 bytes
SHA-256: a0bbfc082f98783fdd447455211163ff4a121f10355b931e3c7b5c7609f08a4a

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