Malicious PDF — malware analysis report

Static analysis result for SHA-256 51dcfab35eaeda97…

MALICIOUS

PDF

35.5 KB Created: 2021-07-04 17:30:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: dabead565498d572d5f8d46f2040834d SHA-1: 72cf315543e821c01e836d82d8b2f6025b4b3d00 SHA-256: 51dcfab35eaeda97533ed6df86f4267456ebb21dc8fb17980d06a0eb62fe958d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one pointing to a known malicious redirector infrastructure at http://netcdn.tw/app/406889139/coin-master-reward-link-game-hack. This lure is presented as a 'free generator / game hack', aiming to trick users into clicking. The presence of multiple PDF-specific heuristics flagging malicious redirectors and lures, along with the ML classifier's high confidence, supports this assessment. No scripts were extracted from this sample.

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-reward-link-game-hack In PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-daily-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/coin-master-hack-2021-app-download_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-robux-for-no-money_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-robux-no-email_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/roblox-exploit-for-free-download_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-robux-cards-2021-march_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-spin-app-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/hack-jailbreak-roblox-2021_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/comment-hacker-roblox-sur-bubble-gum-simulator_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-spin-link_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/instant-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-robux-planet_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-robux-watch-videos_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/roblox-undertale-monster-mania-how-to-get-reset-2-free_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/synlapse-roblox-free-download_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/pubg-uc-or-bp_GM1330123889.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/instatn-robux-hack_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-robux-no-survey-or-deals_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
stream_002_off0000320a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x320A 23632 bytes
SHA-256: 875c7ee1c49fc39cea820fa06ad2446527f7fd669ebb564f1afff5c88d07d8e7
font_01_sfnt_off000067d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67D0 18340 bytes
SHA-256: c1246ab1d9e393b3d89bf1ae428e5235d00f0bb5ef049749243bc3f4df939c9c

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