Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf1f4f037381958…

MALICIOUS

PDF

46.2 KB Created: 2021-05-15 17:13:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0380ba204faf177ccd97e582066d6bda SHA-1: 8c2a0166e627c143be8c64b6e25400e3dc6d182d SHA-256: 7bf1f4f0373819586970521ab5548574cf6e86f2b22a3ad5dbdb06697643e5bb
182 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are SEO-optimized PDFs designed to lure users with promises of game-related benefits like 'Robux Generator' or 'Coin Master Free Spins'. The presence of a fake CAPTCHA heuristic indicates an attempt to trick users into performing an action, likely to download a payload or visit a malicious site. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9278

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/roblox-robux-generator-no-human-verification-game-hack PDF link annotation
    • http://pesok-rk.ru/images/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-spins-coin-master-october-13-2021_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/get-coin-master-cards-free_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/coin-master-free-coins-spins_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/100-robux_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/coin-master-codes_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/best-way-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/how-to-get-free-clothes-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-flip-master-coins_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/robuxy-com-generator_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-robux-sites-that-work_GM431946152.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_off000049da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49DA 25264 bytes
SHA-256: da0350479a2502876d8b552ac07aaae1340be5ded43d75d316c0b719bca2757a
font_01_sfnt_off00008414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8414 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off000090bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90BB 18772 bytes
SHA-256: d70e1896760ce565ff795a6c5d74f9ef69d680ae9e1e6e3d1ff99995b7d1b431

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