Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf18d7f5bfbacfab…

MALICIOUS

PDF

46.1 KB Created: 2021-05-12 08:00:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5a34ff4e3a90a689c9ca8eb95fd498c6 SHA-1: 4e9e27a6802b632d27d92f391dcc9d647ae79f88 SHA-256: cf18d7f5bfbacfab37ad27c60b4ca5f5035b64b4be842d4311efc7d23b4b4f53
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links and embedded text promoting 'free generator / game hack' lures, directing users to malicious redirector infrastructure. The primary malicious URL identified is https://netcdn.xyz/app/431946152/oprewards-free-robux-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/431946152/oprewards-free-robux-game-hack In PDF document text
    • http://roberto-gac.org/images/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://roberto-gac.org/images/coin-master-apk_GM406889139.pdfIn PDF document text
    • http://roberto-gac.org/images/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://roberto-gac.org/images/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://roberto-gac.org/images/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://roberto-gac.org/images/free-coinmaster-spins_GM406889139.pdfIn PDF document text
    • http://roberto-gac.org/images/free-game-pack-coin-master_GM406889139.pdfIn PDF document text
    • http://roberto-gac.org/images/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://roberto-gac.org/images/coin-master-free-spins-link-download-for-iphone_GM406889139.pdfIn PDF document text
    • http://roberto-gac.org/images/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://roberto-gac.org/images/free-robux-games_GM431946152.pdfIn PDF document text
    • http://roberto-gac.org/images/spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://roberto-gac.org/images/coin-master-hack-ios-12_GM406889139.pdfIn PDF document text
    • http://roberto-gac.org/images/coin-master-hack-without-human-verification-india_GM406889139.pdfIn PDF document text
    • http://roberto-gac.org/images/minecraft-creative-mode-free_GM479516143.pdfIn PDF document text
    • http://roberto-gac.org/images/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • http://roberto-gac.org/images/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://roberto-gac.org/images/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • http://roberto-gac.org/images/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://roberto-gac.org/images/www-coinmaster_GM406889139.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_off00004a1f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A1F 26164 bytes
SHA-256: 8732a0138f55198a30f371d19857a5bb2f10444d0ec81c808a92ff1c82c637f0
font_01_sfnt_off000085f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85F5 2912 bytes
SHA-256: 02b35010e2614e3cc95ac6414c49295350c91fdfcc4b4cad27ffdbc10e80df7f
font_02_sfnt_off00008ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF1 18756 bytes
SHA-256: ea6a04d6c65882c9dd78ee7ca96c70e45062fdc6b69d68e2fcdc099d3abb6428

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