Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53bb4328fc531c4…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 21:16:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8d014a4c8320d6386034b0bdcee6d899 SHA-1: dd26c8532cdb1facd68bbb367248bd5ce4d3bf68 SHA-256: b53bb4328fc531c48ae3fb4be9f2e91e39f67d99669147f7bf3cb4c1f29fe163
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to redirector domains, specifically advertising free game hacks and currency, which is a common lure for malicious content. The heuristic firings confirm these links point to known malicious infrastructure and a redirector. The document body, though partially corrupted, also contains the primary malicious URL, reinforcing the lure. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

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-group-roblox-game-hack In PDF document text
    • http://lib.fisipumt.ac.id/repository/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/download-cheat-roblox-android-1-com_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-by-just-generating-survey_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/fb-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/tiktok-free-followers-generator_GM835599320.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-gift-in-big-paintball-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-generate-free-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-button-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/robux-hacking-bans_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-roblox-shirt-designs_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-level-up-hack-on-roblox-phantom-forces_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-spins-and-coins-today_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-co_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-free-hair-girl_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-get-free-faces-on-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_off0000320e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x320E 22616 bytes
SHA-256: 3a2999dddf46f4595f1cd0d1491e68405bcdd5747cc12532bb6de594ed01ab4c
font_01_sfnt_off00006431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6431 18968 bytes
SHA-256: 57604ea57d62e2aa634e965ec5800ebb3da15d6ae68f920e4611ad7eaaeb6114

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