Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb0b3fba04ec717…

MALICIOUS

PDF

40.4 KB Created: 2021-05-18 01:49:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e52a65f377857d736076e0b36e9ed3e5 SHA-1: 52970de320028dfc45228e6c05e5e951bc34ccc7 SHA-256: ecb0b3fba04ec71760a337e4db429c3bf7eea7bdb96f827417fb8406717df1f4
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that is identified as a malicious redirector, specifically advertising a 'free generator / game hack' for Robux. This lure is designed to trick users into clicking the link, which then directs them to potentially harmful content or further malicious sites. The document body and metadata confirm the lure's theme and the application used to generate the PDF.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

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/robux-sign-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_off000035c5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35C5 27040 bytes
SHA-256: ef626a08735068562e567900e11156fef4375ded5f23b64cc429ef396c51225e
font_01_sfnt_off00007289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7289 2880 bytes
SHA-256: 93b508a52e047ef4bff1d7d250d9aefd838e5a176ceb5e9be36ada0f8d333e07
font_02_sfnt_off00007c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C77 18260 bytes
SHA-256: d979ccd66367cffe0923c7c168b8d9239fab8865d1d9d8d0be6a8c4d84c57473

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