Malicious PDF — malware analysis report

Static analysis result for SHA-256 409c39d07b06d5eb…

MALICIOUS

PDF

44.9 KB Created: 2021-05-14 06:36:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4d670bd3c3a7fab4e7b5adb19afef9c1 SHA-1: 10fd14bbb02932d26ad9535730a21f1017868459 SHA-256: 409c39d07b06d5ebcfb85d716d654607024f5503ed47c2bd7fd9ba8406ab4f5f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to a malicious website, likely as part of a phishing or scam campaign. The document body and extracted URLs suggest a lure related to game cheats and free spins, aiming to trick users into visiting the malicious site. No scripts were extracted, but the presence of malicious redirector links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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-cheats-free-spins-game-hack In PDF document text
    • http://lechia-sedziszow.pl/images/coin-master-hack-apk-link_GM406889139.pdfIn PDF document text
    • http://lechia-sedziszow.pl/images/coin-master-free-spins-may-11-2021_GM406889139.pdfIn PDF document text
    • http://lechia-sedziszow.pl/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://lechia-sedziszow.pl/images/minecraft-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • http://lechia-sedziszow.pl/images/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://lechia-sedziszow.pl/images/coin-master-daily_GM406889139.pdfIn PDF document text
    • http://lechia-sedziszow.pl/images/hack-coin-master-download-ios_GM406889139.pdfIn PDF document text
    • http://lechia-sedziszow.pl/images/mc-update_GM479516143.pdfIn PDF document text
    • http://lechia-sedziszow.pl/images/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://lechia-sedziszow.pl/images/online-coin-master-free-spin-app_GM406889139.pdfIn PDF document text
    • http://lechia-sedziszow.pl/images/coin-master-hack-injection_GM406889139.pdfIn PDF document text
    • http://lechia-sedziszow.pl/images/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • http://lechia-sedziszow.pl/images/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lechia-sedziszow.pl/images/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://lechia-sedziszow.pl/images/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lechia-sedziszow.pl/images/hack-robux_GM431946152.pdfIn PDF document text
    • http://lechia-sedziszow.pl/images/mcpe-master-hack-unlimited-coins-apk_GM406889139.pdfIn PDF document text
    • http://lechia-sedziszow.pl/images/fake-robux-codes_GM431946152.pdfIn PDF document text
    • http://lechia-sedziszow.pl/images/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://lechia-sedziszow.pl/images/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000450a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x450A 27316 bytes
SHA-256: 4cbe1e0fb8aa8ed82e1692ddde61217715e3d83be7e5d0c310236be0200541db
font_01_sfnt_off00008418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8418 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DCA 18052 bytes
SHA-256: 78e09613e9051ea2c05113a2cb3e2459165660dd7357248de65be6b789990433

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