Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b5f1775f8f5406…

MALICIOUS

PDF

39.8 KB Created: 2021-05-21 02:45:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e4d36d053949ad5d09ec72b44d96274e SHA-1: 1f185dd27cfad70aad45ce1e4b5abe45a417dd74 SHA-256: a9b5f1775f8f54066980ff71083f6489749fa73e7a148a6d802805ef6ca09106
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as game hacks and free generators. The primary lure URL is https://netcdn.xyz/app/406889139/free-spins-coin-master-2021-today-game-hack, which is associated with a high number of redirector links. The document body and embedded artifacts suggest a social engineering attempt to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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 https://netcdn.xyz/app/406889139/free-spins-coin-master-2021-today-game-hack In PDF document text
    • http://modlingua.com/images/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/minecraft-ps4-code-free_GM479516143.pdfIn PDF document text
    • http://modlingua.com/images/free-coin-master-credit_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_002_off0000357a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x357A 25008 bytes
SHA-256: 0a6aa8759a655b32d10cfd2380964a72d35847192e3cdc41dd00951dfd5dfe41
font_01_sfnt_off00006d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D91 3228 bytes
SHA-256: f3cb21a2c58c98545df60c62f4e2b5cf4584d00c642a3cb5b89987787aefa173
font_02_sfnt_off000078d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78D5 18644 bytes
SHA-256: fb34871543d4e589edaa7b6b6daea61d4b413826d533968c66bf721badb2f47c

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