Malicious PDF — malware analysis report

Static analysis result for SHA-256 871a69c6a9a10378…

MALICIOUS

PDF

35.2 KB Created: 2021-06-28 20:18:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 5cc4a94bb386c3d978de0d4bd4734a45 SHA-1: aac8fabea7c9289f73b7b852c7b7ef3dfd7fa36d SHA-256: 871a69c6a9a10378e90428c1a7d4e13bf5521588ef8b9adabac909bba7496f93
220 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are part of a link farm designed to lure users with promises of free game currency and hacks. The primary redirector URL is http://netcdn.co/app/431946152/how-to-become-a-builders-club-on-roblox-for-free-game-hack, which likely leads to a malicious payload or phishing page. The document body and heuristics indicate a social engineering tactic to exploit user interest in popular games.

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.co/app/431946152/how-to-become-a-builders-club-on-roblox-for-free-game-hack In PDF document text
    • http://katalog.stikesmukla.ac.id/repository/roblox-hack-script-2021_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/tiktok-free-fans_GM835599320.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/why-people-ask-for-free-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/buy-hacked-roblox-account_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/how-to-get-roebucks_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/how-to-get-free-robux-inspect-element-2021_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/hacker-outfits-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/roblox-freebies-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/free-robux-mod_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/how-to-get-a-robux-gift-card-for-free_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/roblox-apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/roblox-fast-speed-hack-script_GM431946152.pdfIn PDF document text
    • http://katalog.stikesmukla.ac.id/repository/best-way-to-get-free-robux_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_off0000306f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x306F 22728 bytes
SHA-256: 8eac97c0d91d96375b935e19b697281847f4b33f5e1734cbe4e17a057d12c0ff
font_01_sfnt_off00006357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6357 19508 bytes
SHA-256: a38cb0af4b79dd2d59d8eeb53bba874368b2e3e4388d9ba1fba94aae0dbebe72

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