Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6aa6d8c58775f1c…

MALICIOUS

PDF

50.3 KB Created: 2021-06-13 17:57:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5a568e5b7e8de970b6e347238cd7ed31 SHA-1: 5491aa695e21e481503adddb31e1aa36fca75b02 SHA-256: f6aa6d8c58775f1c2be991b28a9f7dbbc7f3027d822c256ba16d2630ce1d0ea3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, including one that masquerades as a "free Robux generator" or "game hack". The document body and embedded URLs strongly suggest a lure to trick users into visiting malicious websites, likely for financial gain or further compromise. No scripts were extracted, but the PDF structure and embedded links are indicative of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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 http://netcdn.co/app/431946152/free-online-robux-generator-no-surveys-game-hack In PDF document text
    • http://zercalo.org/images/minecraft-cracked-client_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/mcpe-optifine_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-70-spin-link-today_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/cheat-engine-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-please_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-tiktok-views-no-verification_GM835599320.pdfIn PDF document text
    • http://zercalo.org/images/play-roblox-for-free-on-google_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-free_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/roblox-studio-free_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/mad-city-cheat-roblox_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-free-download-laptop_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-spin-generator-for-coin-master_GM406889139.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050aa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50AA 29628 bytes
SHA-256: 7112b233f51600107ef333cb5fb042bad4ae7900001c7d5bd5817ae33e8e0d83
font_01_sfnt_off00009387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9387 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off0000a02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA02E 18832 bytes
SHA-256: 28f1062af94d2662d4445a90c30c981a13b462a08e1457aea0d6a5ae5a61987f

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