Malicious PDF — malware analysis report

Static analysis result for SHA-256 68ca0d75c2aa6108…

MALICIOUS

PDF

43.2 KB Created: 2021-05-17 06:38:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 0f4b98aeb2628997c1150a2696981217 SHA-1: cc06cb6aee4df73349a7dfab54f35f906a31c440 SHA-256: 68ca0d75c2aa61083bb94699ae0945ff17c8cf0262400610216f0ecc28406920
222 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 brand-impersonation credential phishing and 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 0.9969

Heuristics 7

  • 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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/roblox-exploit-scripts-game-hack.
  • 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/roblox-exploit-scripts-game-hack PDF link annotation
    • http://www.pro-futuro.eu/images/coin-master-3rd-village-free-2021-gift-card_GM406889139.pdfIn PDF document text
    • http://www.pro-futuro.eu/images/coin-master-cards-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.pro-futuro.eu/images/coin-master-hack-with-facebook-login_GM406889139.pdfIn PDF document text
    • http://www.pro-futuro.eu/images/coin-master-daily-free-spins-link-today-blog_GM406889139.pdfIn PDF document text
    • http://www.pro-futuro.eu/images/how-can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.pro-futuro.eu/images/minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://www.pro-futuro.eu/images/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pro-futuro.eu/images/how-to-get-minecraft-for-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://www.pro-futuro.eu/images/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://www.pro-futuro.eu/images/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.pro-futuro.eu/images/coin-master-free-spin-link-today-download_GM406889139.pdfIn PDF document text
    • http://www.pro-futuro.eu/images/free-bobux_GM431946152.pdfIn PDF document text
    • http://www.pro-futuro.eu/images/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • http://www.pro-futuro.eu/images/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://www.pro-futuro.eu/images/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://www.pro-futuro.eu/images/toolbox-for-minecraft-pe-mod-apk_GM479516143.pdfIn PDF document text
    • http://www.pro-futuro.eu/images/coin-master-twitter-free-spins_GM406889139.pdfIn PDF document text
    • http://www.pro-futuro.eu/images/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://www.pro-futuro.eu/images/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.pro-futuro.eu/images/how-to-get-free-robux-fast-and-easy_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
stream_003_off000048aa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48AA 27404 bytes
SHA-256: b542ed1feb1816d307797997b5e6b216407dc6f3421bb4a5bfed5c863f4c2343
font_01_sfnt_off000086d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86D6 18184 bytes
SHA-256: 094a9499485b6a56b01a21850e159571c55a798cea0220f924198f071f030942

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