Malicious PDF — malware analysis report

Static analysis result for SHA-256 be21637172486469…

MALICIOUS

PDF

33.4 KB Created: 2021-07-05 23:07:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2c8100d54f64a2910f286b99cdcd2e34 SHA-1: 181d66255ad3729fe87b6822328e9a45c57aa058 SHA-256: be2163717248646927990a2bab47ed03d22c889ff658d7915a9e0c10f5c60448
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a malicious redirector, disguised as generators for in-game currency like Robux. The primary lure is 'free Robux codes', aiming to trick users into clicking the malicious link. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.tw/app/431946152/free-robux-codes-not-used-game-hack In PDF document text
    • http://stitqi.ac.id/website//repository/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/free-robux-generator-no-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/hack-coin-master-android_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/roblox-comroblox_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/stock-speed-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/game-give-free-robux_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/how-do-you-hack-for-2021000-coins-on-flip-master_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/coin-master-free-spins-link-june-2021_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/hack-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/how-to-get-free-robux-2021-easy-no-inspect_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/40-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/free-masks-in-roblox_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
font_00_sfnt_off00002f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F1B 21264 bytes
SHA-256: 4caa4b2f547ee64490fdc9fbe5245ffa72b286ac3d68490a2791be32c5f7e00d
font_01_sfnt_off00005d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D73 18996 bytes
SHA-256: f2ef840589acbf5544ca5c360f8f850f834bdb07628ffcf9725997a7326c7744

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