Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6b2703e955a912…

MALICIOUS

PDF

34.3 KB Created: 2021-07-05 00:25:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 690724145e2553ecfdf808ff129784cf SHA-1: 713bebfd671cbb30925998085af0b852158b6f4d SHA-256: 4a6b2703e955a91222a4ee32ece6a1d9ccea10873a0468dade9905d20025ef92
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically promoting game hacks and generators. The document body and embedded URLs suggest a lure for users seeking in-game advantages, which is a common social engineering tactic. The primary malicious link identified is http://netcdn.tw/app/406889139/coin-master-email-rewards-game-hack.

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-email-rewards-game-hack In PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-free-download-linux_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-hack-roblox-accounts-step-by-step_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-do-you-hack-for-2021000-coins-on-flip-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-hack-deutsch-auf-pc_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-hack-daimonds-on-roayale-high-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-free-play_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-daily-free-spins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-spin-ml-link_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-link-daily-get-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/giftrobux-com-generator_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/optifine-mcpe_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-spins-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-daily-link-game-mod_GM406889139.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_off000030ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30ED 22296 bytes
SHA-256: 09977e3fa420cf8e93e283be807b1446bc8964997d66dd303304383a88aed4a3
font_01_sfnt_off0000627a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x627A 18508 bytes
SHA-256: be70dc984ec234d90e75e5639b12727d51bc5ee300b41734a45a56f830a4a992

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