Malicious PDF — malware analysis report

Static analysis result for SHA-256 2044deb68aadd36c…

MALICIOUS

PDF

36.2 KB Created: 2021-05-20 16:48:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3a97acbbf6c7f6b25532d16ddfb81353 SHA-1: 37955fc5734211279f13727c6b9acf91b203adac SHA-256: 2044deb68aadd36c8ec3f354c47832b8a026dd7bc821d7a1b7102d5f964c8ced
200 Risk Score

Malware Insights

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

The PDF contains multiple links to redirectors and potentially malicious PDF files, disguised as game-related generators or rewards. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' suggests the document may also instruct users to paste content into a command-line interface, indicating a multi-stage attack. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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/479516143/free-minecraft-com-game-hack In PDF document text
    • http://immo360grad.com/images/roblox-rewards-robux_GM431946152.pdfIn PDF document text
    • http://immo360grad.com/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://immo360grad.com/images/get-free-roblox_GM431946152.pdfIn PDF document text
    • http://immo360grad.com/images/coin-master-free-link-daily_GM406889139.pdfIn PDF document text
    • http://immo360grad.com/images/free-spin-and-daily-news-coin-master_GM406889139.pdfIn 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_002_off0000369c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x369C 24360 bytes
SHA-256: 6eacf3c0d55542cd65f9cb613d5b8a5cbefcea983f683c17bada8866846a341a
font_01_sfnt_off00006d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D21 17968 bytes
SHA-256: 1b4885c2af39899205e5d90bbae948db42423f4b52ef91d34878d66166ac5d9f

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