Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c8c9a9285da534…

MALICIOUS

PDF

33.7 KB Created: 2021-07-05 05:46:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7cef000fbf3c1488f9a8dbc47d779e63 SHA-1: 573b54d0a998e0e559446f8c565c9abde6a2fb35 SHA-256: b9c8c9a9285da5343de5646da052571c6cf462849e5ed3b5524ed6824228eadb
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 'free generator / game hack' lures. The primary redirector URL is http://netcdn.tw/app/406889139/free-spins-coin-master-2021-app-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack aimed at tricking users into visiting malicious sites, likely for credential harvesting or malware distribution.

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/free-spins-coin-master-2021-app-game-hack In PDF document text
    • http://stikespantirapih.ac.id/home/repository/https-rbx-place-rewards_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/8bp-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-hackers-list_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-download-roblox-aimbot_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-how-to-get-free-robux-september-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-download_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-roblox-level-7_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-app_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/soros-roblox-hacks-pastebin_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-hack-animation-script_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-robux-hack-generator-2021-november_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/isuku-roblox-free-shop-hose_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/hack-de-robux-rapido_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-apk-hack-unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-tix-generator_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/hacks-para-roblox-descargar-pc_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_off00002ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FF8 21844 bytes
SHA-256: 1c601d3d5b65c53de4ce711edd82d332e7f83526fa7d1af7a25fea0316c03ec1
font_01_sfnt_off00005ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF5 18576 bytes
SHA-256: 15a675c2e57ed79e3df4794bcfdf733c83ffccf7533f1288849b01a630512951

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