Malicious PDF — malware analysis report

Static analysis result for SHA-256 be3326cf7822c719…

MALICIOUS

PDF

48.7 KB Created: 2021-06-07 19:33:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b9d98c96d4af265dd7f77bbb1963c63d SHA-1: c15f27978a33200be3328eb7fd96f86f86c467c4 SHA-256: be3326cf7822c719ac3dce362eed17394926808b4ed17533a9cfd202f27cb0cd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting game hacks and free in-game currency. The primary URL identified is https://netcdn.tw/app/431946152/roblox-freak-bloxers-hacks-game-hack, which is flagged as a malicious redirector. The document body and numerous other extracted URLs from the sbm-nn.ru domain further support the lure-based redirection tactic. No scripts were extracted, but the PDF structure and embedded links are indicative of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/roblox-freak-bloxers-hacks-game-hack In PDF document text
    • http://sbm-nn.ru/images/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-114-4-download_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-mod-apk-unlimited-spin-download_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-pc-download_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-bubble-gum-leviathan-free_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-daily-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-make-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-apk-free-download-016-0_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-spins-coin-master-legit_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/lazyblocks-com-free-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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004fef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FEF 27232 bytes
SHA-256: 3f49ed6fe7b7819f30ac6dfcd78005fed1750446ec241caef555e425984141e7
font_01_sfnt_off00008e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E92 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BA4 18344 bytes
SHA-256: eedf83b88bf69e81d3c51da13c6d69636651a7dda02cf20b33f823e418eb8a12

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