Malicious PDF — malware analysis report

Static analysis result for SHA-256 16cbc3e52850a5c4…

MALICIOUS

PDF

47.0 KB Created: 2021-06-10 20:55:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6fef8472703579844a0052eb9ed76b00 SHA-1: 99b51af760260bb6084e0dd8397cfb879fcf2ffe SHA-256: 16cbc3e52850a5c4b7bf3752aa8c776ede78612beccbad33c9a7e29951cbd94c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'free accounts with Robux' and 'game hacks'. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves luring users to click these links, likely to download further malware or engage in phishing. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/free-accounts-with-robux-2021-game-hack In PDF document text
    • http://simon-skov-fougt.dk/billeder/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/coin-master-heaven-links-free-spins_GM406889139.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/coin-master-real-free-spins_GM406889139.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/como-hackear-coin-master-espaol_GM406889139.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/coin-master-free-spins-uk_GM406889139.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/free-roblox-money_GM431946152.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/coin-master-free-spin-and-trading-group_GM406889139.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/master-coins-free_GM406889139.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/how-to-get-free-minecraft-coins_GM479516143.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/robux-hack-2021-no-download_GM431946152.pdfIn PDF document text
    • http://simon-skov-fougt.dk/billeder/roblox-robux-generator-http-freerobuxgenerator-xyz_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052f2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52F2 27740 bytes
SHA-256: 28e40fb24a1fbcfe845ef83f88ebf8b90cdd66422e812e364ae6f974a6987ed9
font_01_sfnt_off0000934c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x934C 19004 bytes
SHA-256: 6f10063e7662ae07b1b369225bfb6f172565ed5bf596d824858ce865f7d45fd3

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