Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ef74b92193b1a3…

MALICIOUS

PDF

35.8 KB Created: 2021-05-24 10:32:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f9f0ff9dac951e0b89f4d8823f33b95b SHA-1: 79a712caaeec4b3222eee27ecc1fad3c25372de5 SHA-256: 39ef74b92193b1a319dcb9e8d1c2790627ab9dce995e21d0a6b096681fdec322
160 Risk Score

Malware Insights

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

The PDF contains multiple links to redirector domains, specifically advertising 'free generators' and 'game hacks' to lure users. The ML classifier also flagged this PDF as malicious. The embedded URLs likely lead to further malicious content or phishing pages, and the document body contains text and links consistent with a scam. No scripts were extracted, but the PDF structure and embedded links suggest a malicious redirector chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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/479516143/is-minecraft-free-on-ps4-game-hack In PDF document text
    • http://atmos-service.com/images/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdfIn PDF document text
    • http://atmos-service.com/images/free-pet-snacks-coin-master_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://atmos-service.com/images/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • http://atmos-service.com/images/free-coin-master-spins-link-facebook_GM406889139.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_off00003193.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3193 25552 bytes
SHA-256: 7b26172b611ee7bcf2a9853d1bbf5dd7b56cd1b53301b78421ad2ff202bc3e00
font_01_sfnt_off00006c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C2E 17784 bytes
SHA-256: 6bdb79261e2e18097973e8a24e5f78e76fe24063bf06913bb75cbf544b02b3c5

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