Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d10814af9ae2b1a…

MALICIOUS

PDF

44.1 KB Created: 2021-04-25 17:16:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: cbd72f1e1533cc0442d9c82022ecbf53 SHA-1: 0b1f11aa4f726e62fb8e65133d8184cb8e16d3b4 SHA-256: 8d10814af9ae2b1a8348e54571bac8edede7dba840e9770f43044a62a2af08ac
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple embedded URLs that lead to redirectors and pages offering game hacks, specifically for Roblox. The heuristic firings indicate these links point to known malicious infrastructure and are designed as a lure. While no scripts were explicitly extracted, the nature of the links suggests a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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/431946152/roblox-hack-gui-scripts-game-hack In PDF document text
    • https://www.legclub.org/uploads/files/files/carte-roblox-free-card.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/free-roblox-durag.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/clueless-hack-roblox.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/roblox-social-link-cheat.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/roblox-free-privat-server.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/how-to-cheat-at-roblox.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/how-to-earn-free-money-tower-battles-roblox.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/hackeando-en-roblox.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/free-vip-games-roblox.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/roblox-how-to-hack-someone.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_003_off0000410d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x410D 26404 bytes
SHA-256: f1dc9fcca77c79d9df35543cc60b748161f1fb83119302a227eea80c7d74fc3f
font_01_sfnt_off00007d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D98 3312 bytes
SHA-256: 40bd8eebcb3a0d68a8646f1930e84f30a44bfa48525263c6c528f0bc1e9c1677
font_02_sfnt_off000088e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88E8 18724 bytes
SHA-256: 855871f82313ab749c5d23dad579d4016bdc3df6c78eaf1c373f36331187f915