Malicious PDF — malware analysis report

Static analysis result for SHA-256 53870d402ef1a81c…

MALICIOUS

PDF

34.4 KB Created: 2021-07-06 04:59:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f49de4282335a19fa640bbfb4ba340fb SHA-1: 5b225460fd7a988935637fbfab8445aefa5a1d58 SHA-256: 53870d402ef1a81c59acf0035d95cd3453e7e62099f7ffd1e6ca6da022bb15fa
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free currency' to lure users. The primary redirector URL is http://netcdn.tw/app/835599320/is-tiktok-free-to-download-on-iphone-game-hack. The document body and heuristics indicate a social engineering tactic to trick users into visiting 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/835599320/is-tiktok-free-to-download-on-iphone-game-hack In PDF document text
    • https://lib.stie-yai.ac.id/repository/robux-hack-pc-2021_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-robux-website_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-robux-safe_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-unused-roblox-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/very-easy-roblox-hack_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-hack_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/hack-de-robux-100-real_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/cheat-roblox-super-power-training-simulator-2021_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-robux-generator-2021-no-survey_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_off000030dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30DC 22012 bytes
SHA-256: 12493025f755ce64dc80f78685501e9d3ebd3b214d1354647e74b2222c78b44f
font_01_sfnt_off000061cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61CB 18892 bytes
SHA-256: fb3c2cd0185f2f1f55a9916d7322df1d58dde44cb58c6faed70097bdd9bc6207

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