Malicious PDF — malware analysis report

Static analysis result for SHA-256 128c9d2fd2d89fc1…

MALICIOUS

PDF

45.0 KB Created: 2021-06-04 03:43:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 04b56ebf9cf271f3cfec52a8d1684734 SHA-1: dc205ac44ab3e9baabbf5ba2b9386973fd9953f9 SHA-256: 128c9d2fd2d89fc1a9bc2a3f690a5c867bb0c9d59dc0aa867a002c68972f1e1a
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating it's a link farm designed to redirect users to scam or malicious websites, specifically mentioning 'free generator / game hack' lures. The embedded URLs, such as 'https://netcdn.online/app/431946152/free-robux-pins-game-hack', reinforce this by pointing to sites promising game-related cheats. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to exploit user interest in free in-game items to facilitate initial access via phishing or drive-by downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 https://netcdn.online/app/431946152/free-robux-pins-game-hack PDF link annotation
    • http://pustaka.bbppketindan.info/repository/2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-get-free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-spins-coin-master-links-blogger_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-free-spin-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-minecraft-realm-codes_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/oprewards-com-login_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/roblox-fun-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-unlimited-spin-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-spin-links-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-roblox-clothes-for-your-avatar_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-coin-master-spins-link-download_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/minecraft-apk-114-4_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-roblox-gift-card-codes-2021-unused_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-google-play-promo-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-hack-co_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-hack-reddit_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_off0000518a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x518A 26196 bytes
SHA-256: 278c34bfd7d7937ceb4d23ff7ec0a0cc4e42e67d438285a849982b7e4930704b
font_01_sfnt_off00008da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA1 18288 bytes
SHA-256: be7609bd7ddc69eb994b080447c8f3e95bc75a4b3676ce3cbb6c2619f3d9524c

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