Malicious PDF — malware analysis report

Static analysis result for SHA-256 78eeb1f9c1b2cb33…

MALICIOUS

PDF

46.2 KB Created: 2021-05-11 14:46:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 35087ab1cf0b79fa63ee11a8a00fe6a5 SHA-1: 9f8925bdd03b306226117ade18ae8c49a6afeb14 SHA-256: 78eeb1f9c1b2cb33d2f5d5c616decd2cfda3e9fb7d746ba32d8915dc26e7a111
182 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into clicking malicious links, disguised as generators for in-game currency like Robux. The document contains a large number of external links, many pointing to SEO-optimized PDF files hosted on techmobil.pl, suggesting a link farm or redirection scheme. The primary malicious URL identified is https://netcdn.xyz/app/431946152/a-lot-of-robux-game-hack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/a-lot-of-robux-game-hack PDF link annotation
    • http://techmobil.pl/images/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-get-free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/coinmaster-rewards_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/free-minecraft-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/rbx-hut_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/hack-coin-master-apk-2021_GM406889139.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
font_00_sfnt_off000049df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49DF 26012 bytes
SHA-256: 561565200c55d7966bca7c1497c101e1042110ad1d9e89cec0be20e8d9f57743
font_01_sfnt_off00008629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8629 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off000092d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92D1 17952 bytes
SHA-256: 59ace597cf85b15723adf2883f87d3990bd92e723e57ffb30000155e26dd48af

Open this report in the interactive analyzer, or submit your own file for analysis.