Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2b6ed3f2cb0b7d…

MALICIOUS

PDF

36.5 KB Created: 2021-06-26 06:53:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 7734b578c1a9431b6fd0dcd82eb998df SHA-1: a8343caeee203ca65010028b655d4dc6c1d52728 SHA-256: ec2b6ed3f2cb0b7d31c25dca994f4904cbccbbc175eca5241a972dc34e863c53
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 0.9980

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 http://netcdn.co/app/431946152/roblox-paintball-level-hack-cheat-engine-game-hack PDF link annotation
    • https://loba.com.vn/public/upload/files/free-robux-page-no-human-verifaction-no-surves-no-email_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-spin-link-in-coin-master-game_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/boko-no-roblox-hack_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-do-you-get-free-robux-on-roblox-on-ipad_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-facebook-free-spins_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-35-2-hack_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-free-in-app-purchases-jailbreak_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/hack-script-fame-simulator-roblox_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-outfit-maker-free_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-games-just-like-roblox_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-tiktok-followers-no-human-verification-2021_GM835599320.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-roblox-toy-codes_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-tiktok-likes-no-human-verification-or-download_GM835599320.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-hack_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-generator-no-human-verification_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
font_00_sfnt_off0000345a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x345A 23348 bytes
SHA-256: 2ebb93d67041603a6f973135cd850b8a21675ade69bb5d4406cd0793a4fd5ca8
font_01_sfnt_off00006918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6918 19312 bytes
SHA-256: 17c84e2d6cb2a7b33f6558a86dc7a34fbee50d2e4893dd48d245bb43c57305b5