Malicious PDF — malware analysis report

Static analysis result for SHA-256 a051be52debe5ef2…

MALICIOUS

PDF

42.1 KB Created: 2021-05-11 20:38:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 6f414d139ff4aa4a9b2bb662516f9bfc SHA-1: 662ebc986051ad50e66f9fecf3895eb3023c0af0 SHA-256: a051be52debe5ef2c2294d7d6f89698f937cfd2f14deaa7964d9999f76e0b3b6
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/free-coin-master-glitches-game-hack PDF link annotation
    • https://diendientuvn.com/public/upload/files/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/www-free-robux_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/coin-master-free-spin-no-offers_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/how-to-get-free-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/coin-master-get-free-spins_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/coin-master-hack-using-cheat-engine_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/play-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/free-dominus-roblox_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/roblox-free-accessories_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/free-spins-coin-master-2021-app_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/coin-master-free-redeem-code_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/mcpe-master-hack-coin-apk_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/how-do-i-get-free-coins-on-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_off00004b5c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B5C 25264 bytes
SHA-256: 9f85a666e0ab8e0499794896dbdfd5eae42b6b7c7eed83f84f5720fa6ff64655
font_01_sfnt_off00008334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8334 17952 bytes
SHA-256: 46024ec7988d8a29f9899108edac54a6ffad934125eaec0bee682c20bd570941

Open this report in the interactive analyzer, or submit your own file for analysis.