Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3064a3ff991db77…

MALICIOUS

PDF

41.5 KB Created: 2021-05-18 05:02:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 5dd93af3d353954597f08977a65e6f1a SHA-1: 5ba8ac5fdf503f4947bdb4639e126198fe030fd5 SHA-256: e3064a3ff991db7784e5d74ed66a3b017431db6a6e55a3d4adb9b79952cbd088
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically disguised as a 'free generator / game hack' lure. The document body text and embedded URL reinforce this, explicitly mentioning 'Get Free Robux 2021' and providing a link to a known malicious domain. This suggests the primary goal is to trick the user into visiting a malicious site, likely to download further malware or engage in credential harvesting.

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/get-free-robux-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_off000034f9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34F9 28240 bytes
SHA-256: dc9add704d18cb5a51c1460f4a82887156900548b2deb6239bd6e8e41a811691
font_01_sfnt_off000075e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75E7 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off00007ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF6 18520 bytes
SHA-256: 6fe0ff66a16b6ee6dc50657e9361d5c62c74e6da0263e26ac7f67f588141101f

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