Malicious PDF — malware analysis report

Static analysis result for SHA-256 423dd27ae3008faa…

MALICIOUS

PDF

37.4 KB Created: 2021-05-21 17:01:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: e030aea25954e6c3689e10c3ea10f0f1 SHA-1: 8cd44ebb6e5406c4ac206882c637119d298ac858 SHA-256: 423dd27ae3008faab1bbe948088fbb9271b4954268b699e40a8e49a2d16b85f6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of free Robux and game hacks. The document body and embedded URLs indicate a phishing attempt designed to drive traffic to malicious websites. The presence of multiple malicious links and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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-groups-2021-game-hack In PDF document text
    • http://zarinnameh.ir/images/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/pubg-uc-2021_GM1330123889.pdfIn PDF document text
    • http://zarinnameh.ir/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://zarinnameh.ir/images/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • http://zarinnameh.ir/images/how-to-get-free-golden-card-in-coin-master_GM406889139.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_off000033b6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33B6 27164 bytes
SHA-256: 3dcb46b8fa05783e704427c64bba299d63d434765ae082cfa7798255986a502c
font_01_sfnt_off00006fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC1 18592 bytes
SHA-256: 40c688a228a34b1cb0523430700763228a7eb04120cc8b5f4f4e5fd2bdb4007a

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