Malicious PDF — malware analysis report

Static analysis result for SHA-256 af622f136eca14f0…

MALICIOUS

PDF

35.7 KB Created: 2021-05-10 23:03:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 384dd51689f7f380efb88c6ff1de7bab SHA-1: 676b3f3690b815beda3f113d5da5560eb1590a91 SHA-256: af622f136eca14f031e634aaef0f3c3789e7e567a315fe9ad3a99d49d7ae0bec
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating a lure for game hacks and malicious redirectors, specifically pointing to a "how to hack roblox" generator. The embedded URL leads to known malicious infrastructure, suggesting an attempt to redirect users to a site that may host further malware or phishing content. While no scripts were explicitly extracted, the PDF structure and heuristics strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier clean score 0.0282

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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-hack-roblox-to-get-robux-game-hack In 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_off00003349.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3349 23788 bytes
SHA-256: 9529f4f1e910b32b3e81c539c0504c22163bbb2d1d4c9fcc87712161a60833e4
font_01_sfnt_off000068fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68FE 18588 bytes
SHA-256: 6723e17a0e3ea7e17da9fa5ee91cb22fe0fa4706a6f3d09ae44dda015c08872b

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