Malicious PDF — malware analysis report

Static analysis result for SHA-256 90edb4c5586df996…

MALICIOUS

PDF

40.4 KB Created: 2021-04-24 15:35:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 95350f8b5f7842b10c642e759b3dfafa SHA-1: 277345899fdeac8fb1e69f3dd2a7d11350d1b5a1 SHA-256: 90edb4c5586df996e329032a0282ddd58f816497b5f34e36fabd3db1041ba45d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free Robux' or game hacks. The primary lure is the URL https://netcdn.xyz/app/431946152/how-to-get-free-robux-iphone-5-game-hack, which is flagged as a known malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a social engineering tactic to drive users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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/how-to-get-free-robux-iphone-5-game-hack In PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/como-hackear-robux-en-roblox.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/how-to-hack-apocalypse-rising-on-roblox.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/how-to-use-a-script-hack-roblox-game.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/hacks-for-exq-tops-roblox.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/how-to-change-you-name-in-roblox-hack.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/inject-hack-roblox-free-robux.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/how-to-get-free-money-in-the-plaza-roblox.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/how-to-get-free-admin-on-roblox-2021.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/how-to-get-roblox-clothes-for-free-2021.pdfIn PDF document text
    • http://srisaket.nfe.go.th/UserFiles/File/roblox-edit-money-value-cheat.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_003_off000040cd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x40CD 24988 bytes
SHA-256: 2ff80bf7c0099409562391c9ee54cbc2a3de0ab4da953247df61d8ae21f9efe8
font_01_sfnt_off00007a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A75 18760 bytes
SHA-256: ee250b89ef9ffd56c82f19ae68fe74cb19f7c0db6caa3eeaff10e5bc8e15b8bf

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