Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1cda172e7fbc81…

MALICIOUS

PDF

34.1 KB Created: 2021-06-18 19:01:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3296daac923fff63eb901282f73e1069 SHA-1: 6b370f8d95489f3f12a68bd412b8f3d4858f00c1 SHA-256: cb1cda172e7fbc81ee15fac6d8201b927f56e6d5945898b9bf03dd1161b9c463
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/hack-roblox-jailbreak-game-hack PDF link annotation
    • https://koeltotaal.com/images/coin-master-free-spins-fb_GM406889139.pdfIn PDF document text
    • https://koeltotaal.com/images/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://koeltotaal.com/images/microsoft-roblox-rewards_GM431946152.pdfIn PDF document text
    • https://koeltotaal.com/images/coin-master-hack-without-downloading-apps_GM406889139.pdfIn PDF document text
    • https://koeltotaal.com/images/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • https://koeltotaal.com/images/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • https://koeltotaal.com/images/coin-master-free-raid-link_GM406889139.pdfIn PDF document text
    • https://koeltotaal.com/images/coin-master-hacks-iphone_GM406889139.pdfIn PDF document text
    • https://koeltotaal.com/images/when-alone-roblox-has-been-released-for-free_GM431946152.pdfIn PDF document text
    • https://koeltotaal.com/images/minecraft-windows-10-edition-free-with-java_GM479516143.pdfIn PDF document text
    • https://koeltotaal.com/images/jeux-roblox-free_GM431946152.pdfIn PDF document text
    • https://koeltotaal.com/images/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • https://koeltotaal.com/images/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • https://koeltotaal.com/images/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • https://koeltotaal.com/images/how-to-make-free-admin-in-roblox_GM431946152.pdfIn PDF document text
    • https://koeltotaal.com/images/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • https://koeltotaal.com/images/how-to-make-a-free-ad-on-roblox_GM431946152.pdfIn PDF document text
    • https://koeltotaal.com/images/business-simulator-roblox-cheat_GM431946152.pdfIn PDF document text
    • https://koeltotaal.com/images/tiktok-free-coins-apk_GM835599320.pdfIn PDF document text
    • https://koeltotaal.com/images/como-tener-hacks-en-roblox-jailbreak-2021_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_off00002f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F08 22452 bytes
SHA-256: 5a4ad6850298a36d4be9693ed58a1a7e8f1507a5d600f521ea072dcf635b17b6
font_01_sfnt_off0000612b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x612B 18756 bytes
SHA-256: d4405c2ae4228fa2adb7a051bba975cf6f6050d7b0bae4bb7153a4ef71598db9

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