Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4e0c48495bcece…

MALICIOUS

PDF

35.6 KB Created: 2021-06-26 15:59:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 669a53bd6201f756dd26cf507adb0cbe SHA-1: 126d54193ef3399aa4966fbcfcd7a2a1d8379619 SHA-256: 5a4e0c48495bcecef692f2fb5965c8e2c169febb749e44634695e99b47ab68c9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free Robux, a popular in-game currency, directing users to a malicious redirector. The embedded URL, http://netcdn.co/app/431946152/free-promo-code-for-2-million-robux-game-hack, is associated with known malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and heuristics indicate a malicious redirector pattern, likely intended to lead users to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.co/app/431946152/free-promo-code-for-2-million-robux-game-hack In PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-hack-surf-on-roblox_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-free-roebucks-without-verification_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-can-we-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-catalog-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-promo-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-pants-free_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-robux-no-offewrs_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-hack-get-crushed-by-a-speeding-wall-roblox_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/hack-robux-youtube_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/is-the-roblox-app-free_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/robux-withdraw_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3180 22644 bytes
SHA-256: 56724579975045547843703d9898607ea669bc8b73c20d38f7f772ba31f8282c
font_01_sfnt_off0000641b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x641B 19816 bytes
SHA-256: 3a78e00bdcd621485d01f3949c52908275e2bd7eafdc447196e4a97e0dc4e955

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