Malicious PDF — malware analysis report

Static analysis result for SHA-256 552ee15bcaeb0bc8…

MALICIOUS

PDF

44.6 KB Created: 2021-05-12 21:01:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2bfb86a14682777f4e3376076eebd994 SHA-1: f3a6632a844190c4d18eae343af371ce6819969d SHA-256: 552ee15bcaeb0bc84e8bd3d2bdbb4ac9e576ee43cd329b9b1c5e0fbde54cdd0c
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malformed stream and links to known malicious redirector infrastructure, specifically advertising a "free generator / game hack". The primary lure is a link to `https://netcdn.xyz/app/431946152/free-roblox-premium-game-hack`, which is likely part of a phishing or scam campaign. While no scripts were explicitly extracted, the PDF structure and malicious links suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/free-roblox-premium-game-hack In PDF document text
    • http://adveos.com/images/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://adveos.com/images/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://adveos.com/images/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://adveos.com/images/free-headless-head-roblox_GM431946152.pdfIn PDF document text
    • http://adveos.com/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://adveos.com/images/avatar-roblox-game_GM431946152.pdfIn PDF document text
    • http://adveos.com/images/gamesofficenet-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://adveos.com/images/coin-master-hack-apk-no-fb-login_GM406889139.pdfIn PDF document text
    • http://adveos.com/images/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://adveos.com/images/roblox-robux_GM431946152.pdfIn PDF document text
    • http://adveos.com/images/free-roblox-girl-clothes_GM431946152.pdfIn PDF document text
    • http://adveos.com/images/does-coin-master-hack-work_GM406889139.pdfIn PDF document text
    • http://adveos.com/images/coin-master-hack-version-2021-download_GM406889139.pdfIn PDF document text
    • http://adveos.com/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://adveos.com/images/how-to-get-free-coins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://adveos.com/images/coin-master-free-spins-reddit_GM406889139.pdfIn PDF document text
    • http://adveos.com/images/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • http://adveos.com/images/cm-spin-link_GM406889139.pdfIn PDF document text
    • http://adveos.com/images/coin-master-hacking-news_GM406889139.pdfIn PDF document text
    • http://adveos.com/images/roblox-avatar-com_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_off00004780.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4780 25072 bytes
SHA-256: 6967dbf11c8eae29ec190a1f4edb4c081d16f028e101bb39efbdc467e05b5f0b
font_01_sfnt_off0000812f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x812F 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00008ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ADE 18620 bytes
SHA-256: 6b551930cef55f40e6eb23df153e490346d16ddb025fe33a98e4996eaf4f5114

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