Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc7e714c437a7fb…

MALICIOUS

PDF

43.1 KB Created: 2021-05-17 12:12:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 39d8e7bd0626777541b5772e4104dd45 SHA-1: a3f73669f64e6297560a168f1d847bd65047d650 SHA-256: 8cc7e714c437a7fbb5edb3cd20d5602b67e91c7298a52fe1aef5f0ffc48b02c6
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirector infrastructure, specifically promoting 'free generators' and 'game hacks' for popular games. The ML classifier also flagged this PDF with high confidence. The document body contains obfuscated text and URLs that further support the lure of obtaining in-game currency or cheats, which ultimately leads to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 4

  • 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.
  • 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/431946152/instantrobux-game-hack In PDF document text
    • http://kermas.eu/images/free-robux-site_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/free-minecraft-java-edition_GM479516143.pdfIn PDF document text
    • http://kermas.eu/images/coin-master-game-free_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/free-coins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/minecraft-windows-10-key-free_GM479516143.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
font_00_sfnt_off000047c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47C3 27872 bytes
SHA-256: b82fcea38e7518bdf963ab9a834a602659e4725cadfc4700f937694577cfc194
font_01_sfnt_off00008663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8663 18184 bytes
SHA-256: 4d77632c85c001e266779ad9698d54220e11b78bd17d8b0f085f3dc4dd17180b

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