Malicious PDF — malware analysis report

Static analysis result for SHA-256 be3379390e0719d3…

MALICIOUS

PDF

45.0 KB Created: 2021-05-18 23:56:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c56b764f613b0b71f565c88fc621365c SHA-1: b5ecc991aba7587e0d7d4bff172a271b149a0a37 SHA-256: be3379390e0719d3cf1690395f592151cffc22e1351f078ed46ca298b57338c4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, masquerading as generators for free in-game currency. The ML classifier also flagged this PDF as malicious with high confidence. The presence of embedded URLs and the nature of the lures suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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-daily-free-spins-and-coins-2021-game-hack In PDF document text
    • http://huounaixunghe.com/images/master-free-spin_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/links-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/coin-master-free-spins-link-2021-no-verification_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/roblox-dominus-free_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/claimrobux-net_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/free-star-codes-roblox_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/hack-coin-master-site-rssingcom_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/free-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/coin-master-hack-version-33-2_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/coin-master-game-free-spin-download_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/free-coin-master-account_GM406889139.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_003_off00004af5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AF5 31188 bytes
SHA-256: 201a618da2fdd6eea23638767c7d19c221b88913b419addcde9895b1e8d20936
font_01_sfnt_off00008bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD8 18884 bytes
SHA-256: 183333dfce930995a9382150b407cb528e1a5d3dc22f511d9bca322a4b29e614

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