Malicious PDF — malware analysis report

Static analysis result for SHA-256 459c5b1ff84851a7…

MALICIOUS

PDF

39.8 KB Created: 2021-05-15 04:32:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3c112004bbbbd430b19009f2df792069 SHA-1: 87b53e45b3f7e2e28bc9c1f2fb332dcc95855e61 SHA-256: 459c5b1ff84851a7623f713c2a790d33b6ae67a7fbd7236129ff72ebb5bd1d8d
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a lure for a 'free generator / game hack'. The primary malicious URL, https://netcdn.xyz/app/431946152/free-robux-no-verify-2021-game-hack, is linked multiple times and flagged as a malicious redirector. The document body also contains text related to 'Free Robux' and a call to action, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

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://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000032f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32F6 24588 bytes
SHA-256: 8b295be04f14bce9ba661b6b8dc1c2f7d08c312a2ed50f4a1b8118d3318b5ce8
font_01_sfnt_off00006b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B77 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off0000781e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x781E 18848 bytes
SHA-256: 9f147bd5bf62c652754f553854fad05fac0b8df637ce3021f80b740c61e7be7f

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