Malicious PDF — malware analysis report

Static analysis result for SHA-256 499b70db0c5ff7fb…

MALICIOUS

PDF

49.9 KB Created: 2021-06-07 07:11:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 0136eb25b85ba7e512601185874e600e SHA-1: 10ae494d1b3523ce192f197c59d215602e9bd162 SHA-256: 499b70db0c5ff7fb9f47c5ffbf30836e627f29da5dd1457103e2b84876b08c46
142 Risk Score

Malware Insights

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

The PDF document employs a common lure of free in-game currency for popular games to entice users. It contains numerous external links, identified as a PDF link farm, directing to other PDF files hosted on cornerwebstudio.com, likely for SEO manipulation. The primary link leads to a redirector on netcdn.tw, which is associated with game hacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/how-to-get-free-obc-in-roblox-game-hack PDF link annotation
    • http://cornerwebstudio.com/images/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://cornerwebstudio.com/images/pokemon-go-free-7km-eggs-june-2021_GM1094591345.pdfIn PDF document text
    • http://cornerwebstudio.com/images/free-robux-quiz_GM431946152.pdfIn PDF document text
    • http://cornerwebstudio.com/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://cornerwebstudio.com/images/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • http://cornerwebstudio.com/images/http-appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/free-robux-today_GM431946152.pdfIn PDF document text
    • http://cornerwebstudio.com/images/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://cornerwebstudio.com/images/free-tiktok-fans-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
    • http://cornerwebstudio.com/images/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://cornerwebstudio.com/images/how-long-is-the-minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://cornerwebstudio.com/images/robux-website_GM431946152.pdfIn PDF document text
    • http://cornerwebstudio.com/images/today-coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/hacking-apps-for-roblox_GM431946152.pdfIn PDF document text
    • http://cornerwebstudio.com/images/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://cornerwebstudio.com/images/coin-master-hack-apk-no-survey_GM406889139.pdfIn PDF document text
    • https://www.communes.comIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005168.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5168 32040 bytes
SHA-256: 1fa4b908aae1956b7a94fe56ac7e5ec85b29713c9b479714681d8c638659ae04
font_01_sfnt_off000096be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96BE 2880 bytes
SHA-256: 106de1d187d148d03f5c34a802444a7e62d93662ddf359d17cd55770c6c16081
font_02_sfnt_off0000a0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0AF 18216 bytes
SHA-256: 08697f03f8235c157c5f69450fd1139e84c0e872dcb42b4f38fe4aafc11ecc69

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