Malicious PDF — malware analysis report

Static analysis result for SHA-256 aedbb908c6622edc…

MALICIOUS

PDF

29.6 KB Created: 2021-07-19 07:44:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f9ff173693c8f90f4f193791a08528e9 SHA-1: e4a6a8793fc6b621b0bc9d1c9bb15440c7d454de SHA-256: aedbb908c6622edca79b81454e3ed7121c1c363e09de1e117d303e83422c4e1f
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to a URL associated with a 'free Robux' generator, a common lure for malware. The document body explicitly mentions 'Get Free Robux' and 'CLICK HERE TO ACCESS ROBUX GENERATOR', reinforcing the social engineering aspect. While no scripts were directly extracted, the heuristic firings indicate the PDF is designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.0794

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/get-free-robux-game-hack In PDF document text
    • https://elearning.mtsnurulislamblc.sch.id/__statics/gudangsoal/files/free-robux-exe_GM431946152.pdfIn 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_off00001f2c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1F2C 22636 bytes
SHA-256: 9a4d833b241294d4c91af9c7dbaeb6bb10a531bb55a9d4e926379430ac780344
font_01_sfnt_off000051f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51F7 18304 bytes
SHA-256: a623b0ac0ed72c2031e7f594d5c978448605d08bf0c9f56efadd1d348241356c

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