Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c6fae5a5dc9bcf…

MALICIOUS

PDF

44.3 KB Created: 2021-05-15 02:01:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d20e1812fa54a6b123c73c8bcf2a802f SHA-1: 7f6866f3be56c626c9f8b7ebefffc976ec7035c7 SHA-256: 55c6fae5a5dc9bcf21804a15612a76b1f9eb6da596ccbc86420c259f999b9d41
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirector infrastructure, specifically advertising a 'free Robux hacker' or 'game hack'. The document body also contains phrases like 'Free Robux Hacker Us' and 'CLICK HERE TO ACCESS ROBLOX GENERATOR', indicating a lure for a scam. The embedded URLs are the primary indicators of malicious intent, leading to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier clean score 0.0152

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-hacker-us-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_off00003474.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3474 26456 bytes
SHA-256: 4a5db6c5c6ef75b96dc8278fb727a93259ae2484bc310cd2c51ddf79b3388ecd
font_01_sfnt_off000072e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72E0 7420 bytes
SHA-256: 0b188308ab0e7ffce9913d63d697a586f2937cafc51a771db38e3a566cd37e24
font_02_sfnt_off00008b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B4F 18600 bytes
SHA-256: be32b0f906764c1f2317decc7ac5a24a5975e1ace61028a3a9703984df87bb8b

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