Malicious PDF — malware analysis report

Static analysis result for SHA-256 e738e4458cc537e0…

MALICIOUS

PDF

46.0 KB Created: 2021-05-14 18:30:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 38a457adc747ef13446051d9a70ceb4d SHA-1: f32eeb590eebc52ffbbef0de8bb2595ef997d992 SHA-256: e738e4458cc537e00946a28560a65a0b7ab08eceba7249abc321175a2f2acf1c
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a lure for a 'free Robux generator' which redirects to a known malicious URL. The document body and heuristics indicate a social engineering tactic to trick users into visiting a malicious site. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.0126

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/free-robux-generator-no-human-verification-or-survey-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_off00003897.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3897 26192 bytes
SHA-256: a5bc9d555eb1e9f9cbcda72a3ab4a9b708489883d639fd2a7dfc5cda4db5868a
font_01_sfnt_off00007650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7650 7468 bytes
SHA-256: 2f023798e90d9aa081e6375923b9001d300a7ea394ebfff24c52c62fd6d44aa4
font_02_sfnt_off00008ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF5 19556 bytes
SHA-256: 3a60cdb248c638d1e974f8488a9d0c49865e0dbecbd8cc682acbe36144e2e86e

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