Malicious PDF — malware analysis report

Static analysis result for SHA-256 00a4a07b3e58576b…

MALICIOUS

PDF

34.5 KB Created: 2021-07-06 11:12:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 48addcb83a22362a40f6ef4b7d72413f SHA-1: b3700dc65fc9edc91fe82b944f226a49515187a2 SHA-256: 00a4a07b3e58576b3ed183b6dfd58b4d983c3a37ccad9aecb268b7348d5a068d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirector infrastructure, specifically targeting users interested in game hacks and free currency. The primary lure is a link to 'coin-master-free-coins-and-spins-app-game-hack', which is hosted on netcdn.tw. The document body and embedded URLs suggest a social engineering tactic to trick users into visiting potentially harmful websites. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

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-free-coins-and-spins-app-game-hack In PDF document text
    • http://lib.akper17.ac.id/repository/how-to-get-admin-tab-on-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/arsenal-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-free-spin-app-apk_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/wurst-client-112-2_GM479516143.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/minecraft-free-no-virus_GM479516143.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-2021-free-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-script-executor-roblox_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/114-4-hacks_GM479516143.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/official-cheats-and-codes-for-roblox-robot-blocks_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_off000030dd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30DD 22856 bytes
SHA-256: 8533d7295d3794527326d0a5f1e1d6d8475cdccc0ee86c9093fe3ef39c2fa3dc
font_01_sfnt_off0000641d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x641D 18348 bytes
SHA-256: 8f4e14d352258b2a04c4750a5c5e6ee18e44525ef82eed3820f54d352c64eef8

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