Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b778893f1b98e4f…

MALICIOUS

PDF

34.8 KB Created: 2021-06-29 03:10:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4ab19cbd61e0ad3695986ffaac390844 SHA-1: a405e3e937a6af408288c1b40373d64f027ca61f SHA-256: 5b778893f1b98e4f31f454449b1fd6b44a5103089060b5d06dedf48862c6eca6
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure, disguised as game hacks and free generators. The document body and heuristics indicate a lure to download content, potentially an archive requiring a password, which is a common tactic for delivering malware. No scripts were extracted, but the overall pattern suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/cheat-codes-for-jail-tycoon-roblox-game-hack In PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/hack-for-sex-in-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/roblox-robux-cheat-youtube_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/esp-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/roblox-om-nom-simulator-hack_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/how-to-spot-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/robux-hack-no-download-2021_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/how-to-get-free-knives-in-roblox-murder-mystery-2_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/free-robux-gift-cards-reddit_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/map-free-robux-card-code-2021_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/freed-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/how-can-you-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/free-roblox-accounts-discord_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/how-to-hack-roblox-on-mac_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/watch-videos-and-complete-offers-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/hack-para-island-royale-roblox-2021_GM431946152.pdfIn PDF document text
    • http://digilib.pustaka.unand.ac.id/repository/flowify-hacks-roblox_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_off00002fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FB2 22524 bytes
SHA-256: 3b4d608550fd7b908bb110ac929f8178e58e6998a4ff16f0191904e01915dd0f
font_01_sfnt_off00006183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6183 19560 bytes
SHA-256: 51f8efac2fc4571db9693cc0fe73d21420f26ca57dbdb5fceeec7b537973efc5

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