Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5c50f59590e925…

MALICIOUS

PDF

42.5 KB Created: 2021-05-11 22:02:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ec658ba4fb1011e102baad4260aa471c SHA-1: 4a4a1fb291507effe92378f100286cdb4286836e SHA-256: af5c50f59590e925ba83a480830c8989e72f7a339b3305c5e3ec0fb62079ba82
142 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are structured as SEO link farms for game hacks and generators. The document body and heuristics indicate a lure to click these links, likely to download further malicious content or redirect to phishing sites. No scripts were extracted, but the PDF structure and link farm heuristic strongly suggest a malicious intent to exploit user interest in game cheats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/hack-coin-master-2021-game-hack PDF link annotation
    • http://nationshield.ae/userfiles/files/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/oprewards-points-generator_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/hack-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/coin-master-download_GM406889139.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/what-is-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/coin-master-free-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/coin-master-hack-version-download-2021-android_GM406889139.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/free-role-in-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_off0000497a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x497A 25536 bytes
SHA-256: 6f86f853650fd192f245d4e473ebab1670f69621a8e8485cb66ba1bf23c5a41e
font_01_sfnt_off00008422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8422 18116 bytes
SHA-256: a3df71077179c7440b1e4836f0868e786a4fbdd8e53d65e7c5dca2578e10a822

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