Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea798f4ccef990fa…

MALICIOUS

PDF

42.7 KB Created: 2021-05-13 00:11:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 30f8ea90a8743bf12491bbbfbfa8b764 SHA-1: 90be906b4acf8c21a1da23b8bbe4f3c9d048c00c SHA-256: ea798f4ccef990fa32b1ab21883373b38f1bda1a6444e33bbe5eb05a2a11b4e5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game currency and hacks to entice users. It contains multiple links, including one to a known malicious redirector infrastructure at `https://netcdn.xyz/app/406889139/coin-master-free-spins-1-coin-master-game-hack`. The document body and embedded URLs suggest a phishing attempt related to popular games like Coin Master and Roblox. No scripts were extracted, but the presence of malicious links and the lure indicate a phishing or scam campaign.

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/coin-master-free-spins-1-coin-master-game-hack In PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/how-do-i-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/mcpe-master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/i-need-robux_GM431946152.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/minecraft-tower-defense-2-hacked_GM479516143.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/free-robux-real_GM431946152.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/master-free-spin_GM406889139.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/minecraft-pocket-apk_GM479516143.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/get-gold-coin-master-village-hack_GM406889139.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/free-group-roblox_GM431946152.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/is-minecraft-free-on-switch_GM479516143.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/hack-para-coin-master-sin-verification_GM406889139.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/how-to-get-minecraft-coins-for-free_GM479516143.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_off00004c37.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C37 25964 bytes
SHA-256: 29c357cdceb72fa30443b95ceaece10da52237250db0e71ea8be542fdff02948
font_01_sfnt_off0000857e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x857E 17992 bytes
SHA-256: 6d8d99a319dc3508354c514a9dfb36b9314a67d789b860417dc5e127b03e5453

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