Malicious PDF — malware analysis report

Static analysis result for SHA-256 891b0e0e184c3323…

MALICIOUS

PDF

41.5 KB Created: 2021-06-07 04:59:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 03611b4388b67e673ebab1a78f27bf2d SHA-1: bd19eb3ceec6059e58279483a74d47ed135fe864 SHA-256: 891b0e0e184c3323e8581fb4e4164526d94de70c9461076afc6f1afbaee809e0
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple critical heuristic firings indicating it links to malicious redirector infrastructure. The document body and embedded links explicitly point to a lure for "Free Roblox Gif Card Codes" and "free-roblox-gif-card-codes-game-hack", which redirects to the malicious URL. This suggests a phishing or scam attempt designed to trick users into visiting a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0284

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.tw/app/431946152/free-roblox-gif-card-codes-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_off00003a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3A64 25612 bytes
SHA-256: b4758ac16374e71218d97d921307f7b10fead7eaaf66eb109b02848c40ecf007
font_01_sfnt_off00007642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7642 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off00007fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE1 18472 bytes
SHA-256: 5f49f5751d60250ebbd9d2752d51c98d6f8166cfc6e9c4f2d99ebd1258fbbff3

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