Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef70b65cd03852e0…

MALICIOUS

PDF

34.3 KB Created: 2021-06-29 10:54:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c49a10737b77a7a95a1d179750e3beb1 SHA-1: 4f14e4c8fd44a7bd9a29555e7f81716aece1d61b SHA-256: ef70b65cd03852e0edfb453d4926958555dbbd0c94fda3ca76f2397756bc7ac2
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 generators' and 'game hacks' for popular games. The primary lure URL is http://netcdn.co/app/431946152/free-mobile-24-info-robux-game-hack, which is flagged as a malicious redirector. The document's content and embedded links strongly suggest a phishing or scam attempt to lure users to potentially malicious 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.co/app/431946152/free-mobile-24-info-robux-game-hack In PDF document text
    • http://elibrary.perludem.org/repository/how-to-hack-any-account-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-get-free-tiktok_GM835599320.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/master-hack-coin_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-realistic-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/youtube-inquisitormaster-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-group_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/best-roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-use-roblox-hack-scripts_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-stella-exploit-free_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/hack-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/lumber-tycoon-2-glitch-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-coin-master-spins-blogger_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/cheat-prison-life-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-hack-roblox-with-nmap_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_off00002efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EFB 22216 bytes
SHA-256: 6c4347f5da5518caf6d2abc9c2c4f52d3e5ea6af60a4bd452b9c557fca4a6e12
font_01_sfnt_off0000604a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x604A 19292 bytes
SHA-256: c340568d188cb5b9bde672b74740897d4ecad2b9fe99af44133c9d580995e474