Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be68f4660bb415f…

MALICIOUS

PDF

48.5 KB Created: 2021-05-11 15:30:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7b6024406060a39446aa75c3e3a948da SHA-1: 54b9a96ae69fa5c944cbc8cea5b743b1f65ddf24 SHA-256: 1be68f4660bb415f18ce3b917a386ca41834fea42a63aff7cca1a7e497a0fc71
182 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9013

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/431946152/free-robux-without-human-verification-real-game-hack PDF link annotation
    • https://diendientuvn.com/public/upload/files/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/how-to-get-spins-for-free-on-coin-master_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/how-to-get-free-things-on-roblox_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/coin-master-hack-reddit_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/free-roblox-passwords_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/how-to-hack-to-get-robux_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/coin-master-hack-uk_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/how-to-get-minecraft-for-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/how-do-i-get-free-coins-on-coin-master_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/roblox-free-accessories_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/coin-master-claim-spins_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/buy-robux-free_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004cb4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CB4 29192 bytes
SHA-256: 5aaa936966eebdf53b9d58b842bc105f387d4a0904464e2f9d2aa4590a0ea9aa
font_01_sfnt_off00008ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EA6 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off00009856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9856 19296 bytes
SHA-256: fcd37aae12381262441149b3f055c838aea0a99c045645b338d4096dcdd54a9c

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