Malicious PDF — malware analysis report

Static analysis result for SHA-256 81818d37282d0083…

MALICIOUS

PDF

38.5 KB Created: 2021-05-21 17:42:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e38a1bf1eeabbd4adeabb18b6699e50b SHA-1: f1099c8d709ee72f6ec826e3db20b5ba71330d3b SHA-256: 81818d37282d00832f037e84d0a2600c30f92ac00749aef450b55ecadf4f2630
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" for TikTok followers. The document body and embedded links suggest a social engineering lure to drive traffic to potentially malicious websites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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/835599320/free-tiktok-followers-no-human-verification-or-survey-2021-game-hack In PDF document text
    • http://eltisstudio.sk/images/coin-master-free-spins-bit-ly_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/free-roblox-com_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/roblox-free-body_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/minecraft-jar-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000030d3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30D3 24900 bytes
SHA-256: 25754cc0565eb4076c9b1e1af0fbd2ac803472a45200ce31e738b3af63b38fb7
font_01_sfnt_off0000689a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x689A 2840 bytes
SHA-256: 0ff7203f6678b3ce5cadf82d8d4ab75daf80d11355a5b436446d16072593a6f7
font_02_sfnt_off00007255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7255 19152 bytes
SHA-256: c6aae516a535c20688ad74e4aa12997c302b82eea592ee03757e951f101f6a27

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