Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4273ad62097d7d6…

MALICIOUS

PDF

43.2 KB Created: 2021-05-16 05:26:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e7bfffe01d1367190f9b7cb18f32a80c SHA-1: 0959dc731a7c23092aeffdad4d28c5451e7cc2ea SHA-256: b4273ad62097d7d612055d762a811bd572f795a5b6eee6f761d1a8a9a25361b9
182 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 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 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/how-can-u-get-free-robux-game-hack PDF link annotation
    • http://atmos-service.com/images/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/how-can-i-get-free-coinsn-coin-master_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/oprewards-points-generator_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/coin-master-hack-tool-no-survey_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/abd-roblox_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/what-do-roblox-points-do_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/coins-master-hacks_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/free-roebucks_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/minecraft-java-account-free_GM479516143.pdfIn PDF document text
    • http://atmos-service.com/images/how-to-earn-robux-fast_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/coin-master-free-spin-reward-links_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/free-robux-no-verify_GM431946152.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004abc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ABC 25624 bytes
SHA-256: 8af5940db7c00dba890ad9ca8bd3382247124a2a87d1ed6f113463ad4addba48
font_01_sfnt_off00008508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8508 18696 bytes
SHA-256: 6d387a6157482ae5d4424ea2a1b018d5f079fe6dbc45eeb2149446a5bd008250

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