Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7ebc3bc2c1491e…

MALICIOUS

PDF

39.0 KB Created: 2021-05-24 10:30:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5017ecf9c1304f6d6fa921dee2e14d57 SHA-1: d5a01a50fde0449966ded9959c0a0f06a4eef839 SHA-256: 1c7ebc3bc2c1491ebfbff921f4dbcb5433ddab3f154a267f5f70c67eb2165052
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure related to 'free Robux' and includes a critical heuristic firing for a malicious redirector link. The embedded URL directs to a site offering a 'game hack' and 'generator', which is a common social engineering tactic. No scripts were extracted, but the document body and heuristics strongly indicate a phishing attempt to redirect users to a malicious website.

Machine Learning

  • Nyx PDF Classifier clean score 0.0795

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/how-to-get-free-robux-without-verification-or-surveys-game-hack In 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_off00002d0e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2D0E 32628 bytes
SHA-256: a64c61c2eb70ad29f43f42cb01e44e51df4f486447f33066149599865f5ebe0e
font_01_sfnt_off00007417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7417 19424 bytes
SHA-256: 30551668946d9b3d80fdd5a427c07e5f2c52faec585ae3c44dbbbd4d67cc7463

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