Malicious PDF — malware analysis report

Static analysis result for SHA-256 f806eddb8de9f071…

MALICIOUS

PDF

36.8 KB Created: 2021-05-30 01:06:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0758a1a6965603a289b35d808e31c786 SHA-1: 9d0dcea97d7ee70f1866645e2cba5f4be6b31fc3 SHA-256: f806eddb8de9f071273bfa958e5d2bb0ac2924ae4fea0c1943668afe10791b90
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple links pointing to a domain known for malicious redirectors, specifically advertising a 'free Robux generator' which is a common lure for malware. The document body also contains a call-to-action phrase, reinforcing the phishing nature of the lure. The primary IOC is the malicious redirector URL used in the lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.1044

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-obby-game-hack In PDF document text
    • https://indonga.com.vn/wp-content/uploads/fsqm-files/freer-pro-tiktok_GM835599320.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_off0000312b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x312B 26308 bytes
SHA-256: 00a74a63c5c8ad7910ff2e5868b0585075269022596ee955fefb485dc3ab6193
font_01_sfnt_off00006efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EFD 18196 bytes
SHA-256: adb317c4997580e24d4ed6f1d3168dfe6823b431b7b24dbbc6245ab95f909cf9

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