Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab5a18a1a39dec89…

MALICIOUS

PDF

43.6 KB Created: 2021-05-13 11:04:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ae65f1c98258af1b8635924eb00a6e64 SHA-1: 2875d3e88f4bdc5360908a6583b4b062e2570fc6 SHA-256: ab5a18a1a39dec89c2027d6f5e7072d5727b10cce1c00c58aa61d8965748a89f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free Robux' or game hacks. The presence of a visual download button and the ML classifier's high confidence score indicate a malicious intent to lure users into clicking these links. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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-2021-game-hack In PDF document text
    • https://topkoreamart.com/public/upload/files/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/robux-gainer_GM431946152.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/roblox-toy-codes-free_GM431946152.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/free-robux-ad_GM431946152.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/coin-master-daily-free-spins-today_GM406889139.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/coin-master-hack-tool-without-human-verification_GM406889139.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/hack-coin-master-game-apk_GM406889139.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/how-to-coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/roblox-hack-app_GM431946152.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/free-minecraft-hosting_GM479516143.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/daily-free-spins-coin-master-heaven_GM406889139.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/coin-master-34-4-free-download_GM406889139.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/coin-master-free-coins-link-2021_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_003_off00004a60.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A60 25760 bytes
SHA-256: 91638aa0b7b78e375d9279150bb97d4bb8e656e376254b390cf304496279445f
font_01_sfnt_off0000854f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x854F 19260 bytes
SHA-256: cfeb00e99c7da41c79bd6814c2de1bf58f441159bdfe452787b9448ffd27beb4

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