Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5ebcb2f2c95389…

MALICIOUS

PDF

35.5 KB Created: 2021-05-22 06:52:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: dc1adb3d25b678d3d284b90e82d75b04 SHA-1: 5024172bde233d135766bed0fea8e3b59af9a6ca SHA-256: 1b5ebcb2f2c95389ca0b09e68f938b1f7b37e8bae2b00a499003f63039bca7a3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors and scam-related URLs, disguised as a 'Free Robux' generator. The document body explicitly mentions 'Free Robux No Verify 2021' and 'CLICK HERE TO ACCESS ROBLOX GENERATOR', reinforcing the lure. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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/free-robux-no-verify-2021-game-hack In PDF document text
    • http://jointworkstudio.com/images/free-minecraft-skin-packs_GM479516143.pdfIn PDF document text
    • http://jointworkstudio.com/images/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • http://jointworkstudio.com/images/free-spins-link-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://jointworkstudio.com/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://jointworkstudio.com/images/free-robux-with-no-human-verification_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
font_00_sfnt_off00003125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3125 23796 bytes
SHA-256: 6b5a18068f059bdd91e15351534cb07dba43b153cbe664cc67a6838d6bd0c3b3
font_01_sfnt_off00006775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6775 18848 bytes
SHA-256: 9f147bd5bf62c652754f553854fad05fac0b8df637ce3021f80b740c61e7be7f

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