Malicious PDF — malware analysis report

Static analysis result for SHA-256 4137c3246c3bc935…

MALICIOUS

PDF

45.4 KB Created: 2021-05-16 00:02:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fcdb4a4e404d8a7ecd23837694584119 SHA-1: 3a088e1258ebd6fce9e3be4f4aa633172917b1e3 SHA-256: 4137c3246c3bc9357c1ed85ef83f160561ecce85d46bee37ea101b75445f739f
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and IP addresses, disguised as "free generator" or "game hack" lures. The document body, though heavily obfuscated, contains a URL pointing to a malicious redirector, reinforcing the malicious intent. The presence of these links and the ML classifier firing strongly suggest a malicious document designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

Heuristics 5

  • 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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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-free-spins-coin-master-link-game-hack In PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/roblox-hack-me-robux_GM431946152.pdfPDF link annotation
    • http://103.19.59.42/__statics/gudangsoal/files/how-to-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/free-coin-master-spins-no-verification_GM406889139.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/roblox-free-body_GM431946152.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/hack-coin-master-32-mod-apk_GM406889139.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/robux-free-online_GM431946152.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/coin-master-hack-apk-35-18_GM406889139.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/rbx-claim_GM431946152.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/coin-master-hack-account_GM406889139.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/roblox-2021-hack_GM431946152.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/coin-master-free-spins-link-2021-blogger_GM406889139.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/coin-master-free-spin-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/free-texture-packs-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://103.19.59.42/__statics/gudangsoal/files/coin-master-free-spins-hack-2021_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_off00004cef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CEF 24924 bytes
SHA-256: 50156457cd6201b5fad872124f5aff77fa284b8d7fd98574286eeaa997d8f5c4
font_01_sfnt_off0000860c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x860C 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FBD 18056 bytes
SHA-256: ab85056fbf29cd03dcfab7de7beb0343ed26656e2e8858e8ad52cb7aa31a5a92

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