Malicious PDF — malware analysis report

Static analysis result for SHA-256 62208240098b0cd9…

MALICIOUS

PDF

42.1 KB Created: 2021-05-14 12:08:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7cc3144d9073dc90c2b8b530b8f2c492 SHA-1: 42c019cebb935a3ea3ed7011753a3795bcaef2e0 SHA-256: 62208240098b0cd9369ee611a92228ca917af6e7f384c71d09787bd2b0d8a9ef
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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/get-free-spins-coin-master-link-game-hack PDF link annotation
    • http://grafi-web.be/images/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://grafi-web.be/images/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://grafi-web.be/images/coin-master-hack-apk-33-download_GM406889139.pdfIn PDF document text
    • http://grafi-web.be/images/how-to-win-attack-madness-in-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://grafi-web.be/images/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://grafi-web.be/images/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • http://grafi-web.be/images/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://grafi-web.be/images/free-spin-link-in-coin-master-game_GM406889139.pdfIn PDF document text
    • http://grafi-web.be/images/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://grafi-web.be/images/coin-master-hack-link_GM406889139.pdfIn PDF document text
    • http://grafi-web.be/images/lucky-patcher-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://grafi-web.be/images/roblox-free-clothes-girl_GM431946152.pdfIn PDF document text
    • http://grafi-web.be/images/free-roblox-clothes-codes_GM431946152.pdfIn PDF document text
    • http://grafi-web.be/images/how-to-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://grafi-web.be/images/hack-coin-master-game-download_GM406889139.pdfIn PDF document text
    • http://grafi-web.be/images/coin-master-free-bonus_GM406889139.pdfIn PDF document text
    • http://grafi-web.be/images/how-to-get-free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://grafi-web.be/images/public-enemy-sun-prairie-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://grafi-web.be/images/free-free-robux_GM431946152.pdfIn PDF document text
    • http://grafi-web.be/images/you-promised-my-son-free-robux_GM431946152.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_off00004956.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4956 25060 bytes
SHA-256: 62ae07e8cd43043aac4bb33fcb3cb2bf732d0935a821732c0522a5ad89798fca
font_01_sfnt_off000082b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82B5 18056 bytes
SHA-256: ab85056fbf29cd03dcfab7de7beb0343ed26656e2e8858e8ad52cb7aa31a5a92

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