Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a793e200b4d549…

MALICIOUS

PDF

41.9 KB Created: 2021-05-13 23:37:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0a5cfa7c0cbffcd2174ece207804699f SHA-1: 782f234100ed520e39cbb59779dc78e8caf6ee51 SHA-256: a3a793e200b4d54938d8d5a341baf01a774473999b0b89cffe0e1dc584c39524
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The document body and embedded URLs strongly suggest a phishing or scam attempt designed to trick users into visiting malicious sites. No scripts were extracted, but the PDF's structure and embedded links are indicative of a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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/coin-master-daily-free-spins-and-coins-game-hack In PDF document text
    • http://ralf-gryga.de/images/free-minecraft-premium-account_GM479516143.pdfIn PDF document text
    • http://ralf-gryga.de/images/2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://ralf-gryga.de/images/mcpe_GM479516143.pdfIn PDF document text
    • http://ralf-gryga.de/images/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • http://ralf-gryga.de/images/minecraft-18-9-hacked-client_GM479516143.pdfIn PDF document text
    • http://ralf-gryga.de/images/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://ralf-gryga.de/images/coin-master-free-online_GM406889139.pdfIn PDF document text
    • http://ralf-gryga.de/images/coin-master-cards-for-free_GM406889139.pdfIn PDF document text
    • http://ralf-gryga.de/images/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ralf-gryga.de/images/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ralf-gryga.de/images/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ralf-gryga.de/images/free-robux-please_GM431946152.pdfIn PDF document text
    • http://ralf-gryga.de/images/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://ralf-gryga.de/images/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://ralf-gryga.de/images/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://ralf-gryga.de/images/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://ralf-gryga.de/images/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://ralf-gryga.de/images/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://ralf-gryga.de/images/coin-master-download_GM406889139.pdfIn PDF document text
    • http://ralf-gryga.de/images/free-coins-coin-master-hack_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004987.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4987 24976 bytes
SHA-256: 971c08f5a340fad37b07b5d1c30e10ca53527fb4e531e1b290a9c77a99a77d12
font_01_sfnt_off00008091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8091 18480 bytes
SHA-256: 323fea871d3154f9ddf991b22fd859b77165b4ee4e2d03de0fe4666202988bbb

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