Malicious PDF — malware analysis report

Static analysis result for SHA-256 520317d99d45609a…

MALICIOUS

PDF

47.7 KB Created: 2021-05-13 20:08:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d17d9c5d4972afde9e02569af9a92658 SHA-1: 53bb98345e7e0e51f5bd8754c5ba898234129d74 SHA-256: 520317d99d45609a2443e2d0916b9187e115a63ea16d3e3f3848d54e0dc1b8ea
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically promoting game hacks and free currency generators. The document body and embedded links suggest a lure for users interested in such content, likely leading to further malicious downloads or phishing attempts. No scripts were extracted, but the presence of malicious redirectors and the lure pattern strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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-daily-free-spin-and-coin-game-hack In PDF document text
    • http://dialine.cz/images/minecraft-ps4-code-free_GM479516143.pdfIn PDF document text
    • http://dialine.cz/images/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/coin-master-hack_GM406889139.pdfIn PDF document text
    • http://dialine.cz/images/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/can-you-give-me-robux_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/coin-master-free-spins-link-download-apk_GM406889139.pdfIn PDF document text
    • http://dialine.cz/images/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • http://dialine.cz/images/coin-master-codes_GM406889139.pdfIn PDF document text
    • http://dialine.cz/images/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/www-free-robux-com_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/free-spins-coin-master-april-2021_GM406889139.pdfIn PDF document text
    • http://dialine.cz/images/more-robux_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/free-spin-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • http://dialine.cz/images/coin-master-hack-programmers_GM406889139.pdfIn PDF document text
    • http://dialine.cz/images/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/free-face-roblox_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_off000049d4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49D4 24716 bytes
SHA-256: 98f48c3d3726aa65cf098872d88355cf27952c5db273dfc4871b6e404922ed9c
font_01_sfnt_off000082db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82DB 8676 bytes
SHA-256: e06aca5f85e50ae6cefda302c5299c18ab6d27c174f74f0bb0ee8efa7ccb4468
font_02_sfnt_off00009765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9765 18480 bytes
SHA-256: 323fea871d3154f9ddf991b22fd859b77165b4ee4e2d03de0fe4666202988bbb

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