Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea376fe133768cf…

MALICIOUS

PDF

41.7 KB Created: 2021-05-16 06:18:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: da9c8fb807fff81f77eab32d43b57f52 SHA-1: 71d6380a69ff41d0c1949db45b1f69f709b6f8e3 SHA-256: 5ea376fe133768cfaa84fa39ff60a0d19980b509ec14b60a19c5661f287c93a5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to a known malicious infrastructure, specifically promoting 'game hacks'. The document body, though partially corrupted, contains text and URLs related to obtaining free in-game currency or hacks, indicating a social engineering lure. The presence of multiple PDF-specific heuristics flagging malicious redirectors and lures strongly suggests a phishing or scam attempt designed to trick users into downloading further malware or visiting compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/get-coin-master-hack-game-hack In PDF document text
    • https://fridaytravelnepal.com/userfiles/files/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-free-spins-save_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/synapse-roblox-free_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/haktuts-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/robux-apk_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/how-to-get-free-coins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/how-to-hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/earn-rbx_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/hack-coin-master-link_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/robux-com-free_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-fan_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-400-spin-link-today_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-2021-free-spins-link_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-cheats-free-spins_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/daily-free-spins-on-coin-master_GM406889139.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_off00004a44.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A44 25056 bytes
SHA-256: 3cd9263347706c4b40e967df14cd4c0533686b53e774e1ed7b8eb1868f0863d4
font_01_sfnt_off0000821b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x821B 17716 bytes
SHA-256: 8a0578e54c06e5eadc0c0c8832f5d62fb0328dd393573d3fab931686100c837f

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