Malicious PDF — malware analysis report

Static analysis result for SHA-256 6663bca331d487e9…

MALICIOUS

PDF

35.3 KB Created: 2021-07-05 03:46:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a7a3a844cdb2d7854518a11020dd6c2e SHA-1: c98ee4bc81e7bb50f569fec4cf5e454278632835 SHA-256: 6663bca331d487e940c020fe5d81383b3a3e4131503aa17b95961a84f9973c67
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains numerous links to external websites, many of which are disguised as PDF files related to game hacks and free items. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a tactic to manipulate search engine results or drive traffic to potentially malicious sites. The presence of 'LOLBin token sequence' and the ML classifier's high confidence score further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://netcdn.tw/app/406889139/master-free-spin-and-coin-links-html-m-1-game-hack PDF link annotation
    • http://pustaka.bbppketindan.info//repository/pubg-uc-dundle_GM1330123889.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-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-hack-out-of-bank-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/youtube-how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-hack-roblox-robux-with-cmd_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-spin-coin-master-new-link_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-free-spins-link-facebook_GM406889139.pdfIn macro / runtime command snippet
    • http://pustaka.bbppketindan.info/repository/free-catalog-roblox-ja_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-minecraft-thumbnails_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-jailbreak-teleport-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/gamehunters-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/minecraft-hacks-list_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/tiktok-free-like-generator_GM835599320.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-club-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repositIn macro / runtime command snippet
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003131.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3131 23192 bytes
SHA-256: 852e4206a73fe4d5a92004ba19ee19a7b279aab0879baf0c25b0c05c39933ec8
font_01_sfnt_off00006569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6569 18956 bytes
SHA-256: 85e071f9d2d9aba7decae53ba293d7c98952cf6adb5dc147492857e3bbfc39de

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