Malicious PDF — malware analysis report

Static analysis result for SHA-256 678d97f818a72afa…

MALICIOUS

PDF

43.5 KB Created: 2021-05-14 08:34:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c3c2fb5ad9ffe1fcb14496c4f8a8f153 SHA-1: 1661e672d47df825585f2d9d34791e0cb77e1a31 SHA-256: 678d97f818a72afa83ebf4ecd9d1b01c9a56fbd0e9e5474b7d05920bfe91382c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The document body and embedded links strongly suggest a phishing or scam attempt designed to trick users into visiting potentially harmful sites. While no scripts were directly extracted, the PDF structure itself facilitates the redirection, aligning with common social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://netcdn.xyz/app/406889139/coin-master-free-spins-link-2021-game-hack In PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/coin-master-gold-cards-free-link_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-robux-master_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/coin-master-links-to-free-spins_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/easy-robux-com_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/optifine-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/coin-master-hack-no-verify_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/coin-master-34-4-hack_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/minecraft-hacks-115-2_GM479516143.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/minecraft-115-2-hacks_GM479516143.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/daily-spin_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-to-get-free-robux-easy_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
stream_003_off00004d1e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D1E 25888 bytes
SHA-256: 95ba99ce3a862b22f3a7723b7d4c5152fbe9fcd0ac3032fbcbb9cc4ae5e466b6
font_01_sfnt_off00008734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8734 18456 bytes
SHA-256: 405c435adaafa0da304b7a4986d8f56c56dc87ed278d5cff2ac0c57977d8d7e3

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