Malicious PDF — malware analysis report

Static analysis result for SHA-256 b176ae53b4a65671…

MALICIOUS

PDF

41.2 KB Created: 2021-05-11 18:02:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ec77862530b6683273e835557710c393 SHA-1: 96871caca9805d5f7d247f8db0061a64e616e8d1 SHA-256: b176ae53b4a6567109c44d60b0835569e45bd08a3b160e9ec94bf833ea281961
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting a 'free Robux generator' lure. The heuristic firings indicate that the PDF links to known malicious redirectors and employs a game hack lure. While no scripts were directly extracted, the nature of the lure and the embedded URLs strongly suggest an attempt to drive users to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.0125

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-on-roblox-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
stream_003_off000033d8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33D8 26896 bytes
SHA-256: 7252af18ffc547e158be30bb0d946031766167a9e3b1357e186849130d155159
font_01_sfnt_off000073f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73F7 2928 bytes
SHA-256: ccde583dfb268d3fb8e4f16a70f4aa4392061d90d29ecb78374c4a5fa065647f
font_02_sfnt_off00007e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E25 18756 bytes
SHA-256: 57ee29ca2df633c9559bea9da81b447a7ef2e0dffb4d388bdd233aaad46b31ec

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