Malicious PDF — malware analysis report

Static analysis result for SHA-256 b856391f3e275280…

MALICIOUS

PDF

34.3 KB Created: 2021-07-04 22:59:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 1f170721c4c890b4b1761ebb8e5b55ff SHA-1: 905f60b8f0b9ccfbf29a93c0baf8601fce9b80e4 SHA-256: b856391f3e27528064502f67cd1d2e5d960d19e22cf85d4e6f3aecc3aa76426a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to malicious websites, specifically promoting 'free generators' and 'hacks' for games like Coin Master and Robux. The primary malicious link identified is http://netcdn.tw/app/406889139/coin-master-online-hack-tool-game-hack. The document's content and embedded links strongly suggest a phishing or scam attempt to lure users to potentially harmful sites.

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-online-hack-tool-game-hack In PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-free-spins-that-really_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-get-free-robux-on-a-computer-safely_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-cards-generator-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/btools-hack-roblox-2021-not-rar_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/minecraft-windows-10-edition-free_GM479516143.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-free-robux-codes-pastebin_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/rbxf-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/minecraft-gun-mod-download-free_GM479516143.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-be-a-creeper-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/groups-that-give-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/admin-hack-roblox-ban_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-hack-version-2021-download_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/the-advanced-roblox-coding-book-free_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-codes-2021-july_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/get-free-tiktok-followers_GM835599320.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_off00003111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3111 22776 bytes
SHA-256: dbc6792c764f701b454638a4596b474cda61d9d69a53b89a750cbcdea2e336a5
font_01_sfnt_off0000640a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x640A 18080 bytes
SHA-256: e55d028ed43e44089d97b54b530531a466e653d2d57bed8153c7241ef5bfe6e5