Malicious PDF — malware analysis report

Static analysis result for SHA-256 882c4dd4bf27dbda…

MALICIOUS

PDF

43.8 KB Created: 2021-05-13 21:03:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ff685d20fd5372478292d9a83b2c19c2 SHA-1: b133c88b559f2d0655cd156aef047a08dbc50331 SHA-256: 882c4dd4bf27dbda4d58d0a1b755f392861ef1a714dbb4e204ebe7119ae2a22d
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to a malicious URL. The document body also contains text related to 'free Robux' and 'game hack', reinforcing the lure. The embedded URL is the primary indicator of compromise, likely leading to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0119

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/rbxoffers-earn-free-robux-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000033be.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33BE 25384 bytes
SHA-256: 0293a8e2d88e24b981211a7f332916bbca05d2800866f830f627385e7ba2de3c
font_01_sfnt_off00006e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E05 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off000077ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77EA 7448 bytes
SHA-256: a76ff9b4805dcff342f7268a16e2e3c2ff2b31b96c381fe4deb6ceea777bce90
font_03_sfnt_off000089cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89CC 18244 bytes
SHA-256: fa7b58e8bbd6048af1f0a6b5440a1dcdf7c9ae2c9f232fd911927377916bfdb1

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