Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ab7335345dc116…

MALICIOUS

PDF

31.2 KB Created: 2021-07-19 07:27:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4242d3892574025b571974daa17ee17f SHA-1: 1d26fec159746676b62699103ac0c5b9895ff802 SHA-256: d9ab7335345dc116786686a3d997fc39fef0b5f94a44ab1277f089d4b7a71ec2
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that are identified as malicious redirectors, specifically luring users with 'free generator / game hack' content. The document body and heuristics confirm the presence of these deceptive links, aiming to direct users to potentially harmful websites. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link within the document.

Machine Learning

  • Nyx PDF Classifier clean score 0.0850

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/479516143/best-minecraft-hacks-game-hack In PDF document text
    • https://www.iseas.com/uploaded_files/userfiles/files/free-robux-no-download_GM431946152.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
font_00_sfnt_off00002656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2656 22968 bytes
SHA-256: 431075cb219782e168a626cb0dc008b4835bd3ec38a21ad3e72f8ae5234930d7
font_01_sfnt_off00005988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5988 17952 bytes
SHA-256: 6dfee1982b58ab3489cc821793519200b658269375d8b02cd788103d93863fb8

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