Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7efa576e3d213fd…

MALICIOUS

PDF

43.4 KB Created: 2021-05-13 02:31:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 238cb75671df017c41c6077e50f0923c SHA-1: afa4a675024b1a4bf775c462ae6f294b46f60c3f SHA-256: c7efa576e3d213fd8e9e8f66bb37d3b3bc8b808bedeb2c045582c72f4e4a0b5a
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links designed to lure users into clicking on what appear to be game hack generators and free in-game currency sites. The primary malicious redirector link is https://netcdn.xyz/app/431946152/roblox-studio-free-game-hack, which is associated with known malicious infrastructure. The document body, though heavily obfuscated, contains references to these lures and embedded URLs, indicating a phishing or social engineering attempt to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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 https://netcdn.xyz/app/431946152/roblox-studio-free-game-hack In PDF document text
    • http://laboraltoledo.com/images/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://laboraltoledo.com/images/coin-master-hack-mod-apk-android-1_GM406889139.pdfIn PDF document text
    • http://laboraltoledo.com/images/free-game-packs-for-coin-master_GM406889139.pdfIn PDF document text
    • http://laboraltoledo.com/images/how-to-get-stuff-that-cost-coins-free-mcpe-master_GM406889139.pdfIn PDF document text
    • http://laboraltoledo.com/images/fighting-free-card-coin-master_GM406889139.pdfIn PDF document text
    • http://laboraltoledo.com/images/roblox-free-body_GM431946152.pdfIn PDF document text
    • http://laboraltoledo.com/images/wwwhaktutsin-2021-08-coinmasterfreespinandcoinlinkhtml-m-1_GM406889139.pdfIn PDF document text
    • http://laboraltoledo.com/images/roblox-c9m_GM431946152.pdfIn PDF document text
    • http://laboraltoledo.com/images/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://laboraltoledo.com/images/how-to-hack-coin-master-using-es-file_GM406889139.pdfIn PDF document text
    • http://laboraltoledo.com/images/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://laboraltoledo.com/images/legit-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://laboraltoledo.com/images/coin-master-online-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://laboraltoledo.com/images/coin-master-free-spin-link-twitter_GM406889139.pdfIn PDF document text
    • http://laboraltoledo.com/images/archery-master-3d-apk-and-mod-free-download-unlimited-coins_GM406889139.pdfIn PDF document text
    • http://laboraltoledo.com/images/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://laboraltoledo.com/images/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://laboraltoledo.com/images/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://laboraltoledo.com/images/coin-master-apk-mod-hack-download_GM406889139.pdfIn PDF document text
    • http://laboraltoledo.com/images/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.nrzroblox.comIn 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
stream_003_off00004d9f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D9F 25416 bytes
SHA-256: 8de63e3885aeed8c4372f48189225894552bd7fb8efd6cf50eaf6d3017057a7b
font_01_sfnt_off000086ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86AB 18484 bytes
SHA-256: 5fdc582f30145a96e28329e80bd45567e2bf6a1df475cf6931e13f95db6331fe

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