Malicious PDF — malware analysis report

Static analysis result for SHA-256 8373a889e31700da…

MALICIOUS

PDF

32.4 KB Created: 2021-07-19 08:51:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5d12cfb3716293ced87de4f754ab8559 SHA-1: 9993cc0d631c591e71a9440026d3529d669503e6 SHA-256: 8373a889e31700da108326c64f1d0cbdab12afab341159f66bcf5cfa6a2cc5bc
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for "Free Robux Scams" and "game hack" generators, directing users to the URL http://netcdn.tw/app/431946152/free-robux-scams-game-hack. This URL is flagged as a known malicious redirector. The document body and heuristics indicate a social engineering tactic to trick users into visiting a potentially harmful site, likely for financial gain or further malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.0078

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 http://netcdn.tw/app/431946152/free-robux-scams-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
font_00_sfnt_off00001d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D15 22496 bytes
SHA-256: f40a9ea10490eab2c05d9c1b1686e30a4e3f2ef31f28c99a34d91f3853cffe89
font_01_sfnt_off00004f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F39 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00005be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BE0 18688 bytes
SHA-256: b778a3c2a99961d14742e517d070f3eb9b56258bc2372469447924e166dcdd4d

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