Malicious PDF — malware analysis report

Static analysis result for SHA-256 dafc5c761c320747…

MALICIOUS

PDF

34.8 KB Created: 2021-07-03 21:35:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 502a543974ab15bb3297be61d68c5354 SHA-1: 6c01830dbf8027eefc32c7d66fb7c386ebe3791e SHA-256: dafc5c761c320747471fddd805e88c70768eb70f125593b9b3d1ba663cd2f643
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs that redirect to malicious infrastructure, specifically promoting game hacks and generators. The ML classifier and critical heuristics strongly indicate malicious intent, likely to trick users into visiting a compromised site or downloading further malware. No scripts were extracted, but the embedded URLs and the nature of the lures 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/406889139/coin-master-how-to-get-japan-sushi-card-free-game-hack In PDF document text
    • http://www.digilib.uim.ac.id/repository/minecraft-book-collection_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/minecraft-free-games-no-download_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-guide-to-free-spins-and-rewards_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-spins-link-2021-blogger_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-hack-without-verify_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/robux-free-c_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-hack-roblox-robux-pc_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-hack-tool-no-survey_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-hack-giovannis-roblox-account_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_off000030d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30D1 22572 bytes
SHA-256: 32f5dcf237ffd7645858de7e8679b3df7f21ce1de090f79bc9f94411ca56f624
font_01_sfnt_off00006343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6343 18984 bytes
SHA-256: eeeec89113fe9ffd5234c042272db78e0426ead830ff3aefcc3754689b647ffc

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