Malicious PDF — malware analysis report

Static analysis result for SHA-256 420dab88ad3297e0…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 05:12:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a98be49b683ca31da9d456d1340771b9 SHA-1: f517fb8bd9c764338884d761321416ac9386436b SHA-256: 420dab88ad3297e0cdba4480239d46d7a00c5f862716d7c108195f38cd467073
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users into clicking on what appear to be game hacks or generators. The primary link, http://netcdn.tw/app/406889139/how-to-get-free-coins-in-coin-master-game-hack, points to a known malicious redirector. The document body and heuristics indicate a mass link farm strategy, likely intended to drive traffic to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/how-to-get-free-coins-in-coin-master-game-hack In PDF document text
    • http://library.persadabunda.ac.id/repository/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/best-hack-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-hack-roblox-on-pc-2021_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/hacks-para-roblox-2021-descargar_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-group-roblox_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/roblox-robux-hack-2021-may_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/roblox-inappropriate_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-online-games-for-toddlers-age-4-like-roblox_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/is-minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-hack-unprotected-roblox-games_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-game-hack-app_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-customize-roblox-skin_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-unlimited-robux-hack-is-legal_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-get-free-robux-fast-and-easy_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_off0000319b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x319B 22936 bytes
SHA-256: 1697c88e83236f7273637d9e858a0f06050ba7af3369b4589dcace3fa5442625
font_01_sfnt_off000064fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64FC 18164 bytes
SHA-256: 9fab875a536b983537b9433768b1ea3e5c55ad95c87001a66781b974c182b662

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