Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9971ebde050eda5…

MALICIOUS

PDF

33.8 KB Created: 2021-06-27 20:13:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 068a88939295003b21c52dedf30c16b0 SHA-1: 093b7481b6f58de5430c26b5c15d9de927f99eca SHA-256: c9971ebde050eda54130e884f072e1ef68b7e1fb629983a3c52bb7557ad8bd83
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users to external sites, including a primary redirector at http://netcdn.co/app/431946152/fort-wars-hacks-roblox-game-hack. Heuristics indicate this is a link farm and a malicious redirector, likely intended to deliver malware or lead to scams. The document body and heuristics suggest a lure related to game hacks and free currency, aligning with common phishing and scam tactics.

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/fort-wars-hacks-roblox-game-hack In PDF document text
    • http://www.sanjosedeminas.gob.ec/images/how-to-get-8-robux-free_GM431946152.pdfIn PDF document text
    • http://www.sanjosedeminas.gob.ec/images/how-to-regen-roblox-workspace-if-a-hacker-deletes-it_GM431946152.pdfIn PDF document text
    • http://www.sanjosedeminas.gob.ec/images/roblox-sued_GM431946152.pdfIn PDF document text
    • http://www.sanjosedeminas.gob.ec/images/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://www.sanjosedeminas.gob.ec/images/coin-master-free-coins-cheat_GM406889139.pdfIn PDF document text
    • http://www.sanjosedeminas.gob.ec/images/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.sanjosedeminas.gob.ec/images/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://www.sanjosedeminas.gob.ec/images/infinite-jump-roblox-download-free_GM431946152.pdfIn PDF document text
    • http://www.sanjosedeminas.gob.ec/images/free-candy-roblox_GM431946152.pdfIn PDF document text
    • http://www.sanjosedeminas.gob.ec/images/free-roblox-mobile-app_GM431946152.pdfIn PDF document text
    • http://www.sanjosedeminas.gob.ec/images/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.sanjosedeminas.gob.ec/images/websites-that-give-you-free-robux-by-clicking_GM431946152.pdfIn PDF document text
    • http://www.sanjosedeminas.gob.ec/images/free-spins-coin-master-2021-no-verification_GM406889139.pdfIn PDF document text
    • http://www.sanjosedeminas.gob.ec/images/free-robux-2021-codes-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.sanjosedeminas.gob.ec/images/roblox-free-boombox-script_GM431946152.pdfIn PDF document text
    • http://www.sanjosedeminas.gob.ec/images/roblox-any-game-hack-download_GM431946152.pdfIn PDF document text
    • http://www.sanjosedeminas.gob.ec/images/minecraft-xray-hack_GM479516143.pdfIn PDF document text
    • http://www.sanjosedeminas.gob.ec/images/how-to-get-free-packs-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.sanjosedeminas.gob.ec/images/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://www.sanjosedeminas.gob.ec/images/coin-master-get-free-spins_GM406889139.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_off00002de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DE3 22044 bytes
SHA-256: 1c9dd13fcc912bc16c0ce03047cbcfe679f2f04760a43b5798b40f0a526e6e28
font_01_sfnt_off00005e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E83 19120 bytes
SHA-256: e79b2f35cd02d9f2ebd31c5e3c12285c2de7a387db6892044c49fbcebd3ca344

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