Malicious PDF — malware analysis report

Static analysis result for SHA-256 7826c994aaa8dd65…

MALICIOUS

PDF

34.1 KB Created: 2021-07-19 06:20:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 40ae4783b0be40b001dbba2e6f8502ac SHA-1: a47bba73fa225c73a6b3540da2cbad0e459ddb17 SHA-256: 7826c994aaa8dd65fc39c11a4cd1f0524af11be580b9ec0d71e3bdff12bdce4e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to known malicious redirectors, specifically advertising "game hacks" and "free spins" to lure victims. These links ultimately redirect to other PDF files hosted on `ivpr.net`, which likely serve as further lures or exploit delivery mechanisms. The ML classifier also strongly indicated maliciousness, supporting the observed redirection and lure tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://netcdn.tw/app/406889139/coin-master-free-spins-link-blogspot-game-hack In PDF document text
    • http://ivpr.net/images/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://ivpr.net/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://ivpr.net/images/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://ivpr.net/images/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ivpr.net/images/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://ivpr.net/images/hacks-roblox_GM431946152.pdfIn PDF document text
    • http://ivpr.net/images/minecraft-free-download-windows-10_GM479516143.pdfIn PDF document text
    • http://ivpr.net/images/free-tiktok-fans-no-verification_GM835599320.pdfIn PDF document text
    • http://ivpr.net/images/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://ivpr.net/images/free-tiktok-comments_GM835599320.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002e21.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E21 23176 bytes
SHA-256: 51f0cab111b81c4c9fa68783c0a71f476d96b408455c742da3a73bcbc5afb509
font_01_sfnt_off00006259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6259 18632 bytes
SHA-256: bdbf3986ec68ee3b496ae89412d1d0f392e3b826f1ca321ec58289079c9e4546

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