Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a5b1f387d444c5…

MALICIOUS

PDF

36.3 KB Created: 2021-05-25 10:30:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 81a55f63055c366fe50d6008df09a129 SHA-1: 5b04cbb954683263115a5bba5b99528247e251f0 SHA-256: 21a5b1f387d444c54eb10025f2e29475d01df521aa252af67c2138106e9ff46b
160 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and a lure for game hacks or generators. The primary malicious URL, https://netcdn.xyz/app/835599320/free-tiktok-likes-no-human-verification-or-downloading-apps-game-hack, is directly linked to these lures. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest it's designed to exploit user interest in free in-game items or services to deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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-likes-no-human-verification-or-downloading-apps-game-hack In PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/free-tiktok-likes-trial_GM835599320.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-troll-outfits-free_GM431946152.pdfIn PDF document text
    • https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000033f5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33F5 23584 bytes
SHA-256: 16f20ff28b24105b7678f0bbedbe0670272feb8eb4c21d03704a86d802b6bc09
font_01_sfnt_off000069ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69AC 19260 bytes
SHA-256: 26817b4cedfa85687dbcd5cd5fe0b6768af480ef1d18351329c732120202e544

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