Malicious PDF — malware analysis report

Static analysis result for SHA-256 f839ddca800f2f9b…

MALICIOUS

PDF

33.5 KB Created: 2021-05-24 03:39:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7665238d3713501e58f18de91794e1e3 SHA-1: ac6449ff0621e7db08674f8f6ddee9577021ccd3 SHA-256: f839ddca800f2f9b6f2fb322cea58edccfd5287b8a3a22c9c6f7c8b0ffd18081
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as a lure for 'free generators' or 'game hacks'. The document body and embedded links strongly suggest a phishing or scam attempt to redirect users to potentially harmful websites. No scripts were extracted, but the primary malicious functionality appears to be the redirection via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9506

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/835599320/free-tiktok-hearts-game-hack In PDF document text
    • http://m-sv.net/images/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://m-sv.net/images/free-robux-mobile_GM431946152.pdfIn PDF document text
    • http://m-sv.net/images/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://m-sv.net/images/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • http://m-sv.net/images/coin-master-free-items_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_off00002d01.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2D01 23892 bytes
SHA-256: b938aba1dd66f83878aa5a8879a27ce7a9fd6d83e87e41379643630835750e81
font_01_sfnt_off00006337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6337 17684 bytes
SHA-256: d2d02d8ba990aafabbf3c8139bcf1f40ce6ab80109d0e8cf226d19766131c391

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