Malicious PDF — malware analysis report

Static analysis result for SHA-256 76865b38ff3f6ab4…

MALICIOUS

PDF

34.6 KB Created: 2021-06-27 17:32:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 38ba7299f8195e47740f16550657d851 SHA-1: 87db32d1a812aa0e1b66f8a5dccc82abd5b536cc SHA-256: 76865b38ff3f6ab44a1537b59342acf7a51dfe15595733f4ae93c9bbff80e33f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple embedded links, including one pointing to a known malicious redirector infrastructure at http://netcdn.co/app/431946152/erreur-277-roblox-free-game-hack. This link is presented as a lure for a 'free generator / game hack', indicating a social engineering tactic to trick users into visiting malicious sites. The presence of multiple related PDF files suggests a campaign distributing these lures.

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/erreur-277-roblox-free-game-hack In PDF document text
    • https://morishita-tc.com.tw/image/data/files/robux-hack-no-spam-filter_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-can-i-get-free-robux-super-easy_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-hack-robux-with-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/www-roblox-hack-net_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/minecraft-bedrock-edition-hacks_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-hack-cheat-generator-d_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/hacked-shirts-roblox_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/real-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/new-game-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-bucks-for-free_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-script_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-viking-quest-hack_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-shaggy-old-roblox_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/code-free-robux_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-25-spins-coin-master-links_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
font_00_sfnt_off000030a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30A9 22196 bytes
SHA-256: 0339ca0b0d915e8c8061123a52bafbfc424527ce77a3758c2afad955b24c019f
font_01_sfnt_off00006230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6230 18968 bytes
SHA-256: 1d5a8329f5f896617712207b83093916047875c97218eec75c07ab8e64f47ab6

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