Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b11c95e814b643…

MALICIOUS

PDF

47.8 KB Created: 2021-06-09 02:11:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 18d1ec42ff94c99180e725a0b0fc45cf SHA-1: 4a8b825dfd71aabe5a56b205dd5c2ce2ad9fac86 SHA-256: 55b11c95e814b6436b45fe0ddc679529db9abea2d914b6ea564b026dff1b498e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including one identified as a malicious redirector. The document body and heuristics indicate a lure for game-related cheats and currency, suggesting a phishing or scam attempt. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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-roblox-promo-codes-2021-august-game-hack In PDF document text
    • http://sbm-nn.ru/images/free-roblox-fortnite-gameplay_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-free-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-tiktok-accounts-and-passwords_GM835599320.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-you-get-free-robux-hacks_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-2021-hack_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robuxs-free_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-free-hair-girl_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-vip-gamepass-free-script-hack_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/robux-matchcomfree-robux_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_off0000521a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x521A 29044 bytes
SHA-256: 76acdaf08cb438227b1b469ca8808de307e895d97e32b00e20092290528fb4d5
font_01_sfnt_off00009509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9509 19472 bytes
SHA-256: 552278767b6db81f7ffdc07eb4d968df1aa53e8d3e7b91d072715efbd2e83af7

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