Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d70507e5491ac8…

MALICIOUS

PDF

32.4 KB Created: 2021-07-03 15:30:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 194ba38c4c1c5c801cbf4161509e9a14 SHA-1: d368a0272ef236b594240e73850eee4b90c2b94c SHA-256: 81d70507e5491ac8f19b6c57751db8d1e3ea92ae77183674e3560c8f92e84cf9
160 Risk Score

Malware Insights

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

The PDF document contains multiple embedded links that redirect to known malicious infrastructure, specifically promoting 'game hacks' and 'free generators'. The ML classifier strongly flagged this PDF as malicious, and the presence of redirector links indicates an attempt to lure users to potentially harmful websites. No scripts were extracted, but the document's structure and embedded URLs suggest 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/blox-fun-info-game-hack In PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/mano-county-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-card-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-fun-hack-online_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/roblox-moderators_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-hack-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/800-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-coins_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-free-hats-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-robux-hack-no-download-no-survey-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/script-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/ash-greninja-remix-on-roblox-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/can-you-get-roblox-on-switch-for-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/minecraft-apk-114_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-scam-games-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-email-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-proof-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C62 21308 bytes
SHA-256: f6a852b41012c34ca7e81a3c69bdfc66b47e0cf5e0b4bf9a86ae5e26e7236a21
font_01_sfnt_off00005adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5ADF 18632 bytes
SHA-256: 911c732773a7a1004863e03d2f69206fb35b0346a9dd04ad6343209aabb63a44

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