Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79dcd2d2476dc97…

MALICIOUS

PDF

41.9 KB Created: 2021-05-14 06:06:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2c9ee655f78c846e2b0dd44961d880f5 SHA-1: 3681c2d2ddac0932589e6dd8db63deafefc3fe2e SHA-256: b79dcd2d2476dc976fcd4284a24c4d73751f0ec5f2a0dce236cef0bbaa76972f
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a fake CAPTCHA lure to trick users into interacting with malicious links. It contains numerous links to redirector infrastructure and SEO link farms, suggesting a campaign to drive traffic to potentially harmful sites. The ML classifier strongly indicated maliciousness, and the presence of multiple redirector links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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/406889139/free-spins-on-coin-master-cheat-game-hack In PDF document text
    • http://news123.it/images/facebook-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://news123.it/images/free-minecraft-maps-pe_GM479516143.pdfIn PDF document text
    • http://news123.it/images/coin-master-mod-version-free-download-ios_GM406889139.pdfIn PDF document text
    • http://news123.it/images/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://news123.it/images/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://news123.it/images/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://news123.it/images/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://news123.it/images/rbx-roblox-robux_GM431946152.pdfIn PDF document text
    • http://news123.it/images/free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://news123.it/images/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://news123.it/images/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://news123.it/images/coin-master-free-coins-spins_GM406889139.pdfIn PDF document text
    • http://news123.it/images/coin-master-hack-spin-link_GM406889139.pdfIn PDF document text
    • http://news123.it/images/como-descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • http://news123.it/images/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://news123.it/images/download-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://news123.it/images/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://news123.it/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://news123.it/images/coin-master-hack-spins-android_GM406889139.pdfIn PDF document text
    • http://news123.it/images/how-to-get-more-free-coins-on-coin-master_GM406889139.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_off00004827.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4827 25244 bytes
SHA-256: 37b76908e1bdf072b1006be10b6f85f99a10b49e7016c9136b3f80becc11457a
font_01_sfnt_off00008263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8263 18052 bytes
SHA-256: fe6201d3401ff629ec36fd51f281c53e5c341abf286be0e75cffb2bca1c4c813

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