Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1fe813c89c67216…

MALICIOUS

PDF

34.5 KB Created: 2021-07-03 21:33:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4c9e03668f14f0e85a6bae952b9150a8 SHA-1: b6a14d9a7b1deff18ef1926d2b40b287cbeffd0d SHA-256: b1fe813c89c67216a596cf29ebe803e4c75e04322a9ba902b926e3f64ddebd5f
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to malicious redirectors and IP addresses, masquerading as game hacks and free offers. The heuristic firings indicate that these links lead to known malicious infrastructure and are designed as lures. While no scripts were directly extracted, the nature of the links suggests a workflow intended to download a second-stage payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.tw/app/406889139/coin-master-games-hack-game-hack In PDF document text
    • http://36.94.36.7/elib//repository/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfPDF link annotation
    • http://36.94.36.7/elib/repository/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://36.94.36.7/elib/repository/real-working-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://36.94.36.7/elib/repository/how-to-get-free-robux-no-subscribing_GM431946152.pdfIn PDF document text
    • http://36.94.36.7/elib//repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://36.94.36.7/elib//repository/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • http://36.94.36.7/elib/repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://36.94.36.7/elib//repository/cute-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://36.94.36.7/elib/repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://36.94.36.7/elib/repository/roblox-hack-sans-verification-humaine_GM431946152.pdfIn PDF document text
    • http://36.94.36.7/elib//repository/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • http://36.94.36.7/elib/repository/coin-master-pc-game-free-download_GM406889139.pdfIn PDF document text
    • http://36.94.36.7/elib//repository/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://36.94.36.7/elib//repository/roblox-hacking-website_GM431946152.pdfIn PDF document text
    • http://36.94.36.7/elib//repository/code-free-robux_GM431946152.pdfIn PDF document text
    • http://36.94.36.7/elib/repository/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://36.94.36.7/elib//repository/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://36.94.36.7/elib/repository/roblox-hack-noisense-diamond_GM431946152.pdfIn PDF document text
    • http://36.94.36.7/elib/repository/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • http://36.94.36.7/elib/repository/roblox-moderators_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_002_off0000327c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x327C 22476 bytes
SHA-256: f8461b4f1ba4c1d221cad0391272a22a7bf575d8284143f0e38e52630b59c152
font_01_sfnt_off00006433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6433 18264 bytes
SHA-256: c1c21b29a6afb4d06e4d6845aa9afd5500216469eff45eb2d027be7bd9c24dc5

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