Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a43ce6579deb76d…

MALICIOUS

PDF

34.9 KB Created: 2021-07-04 11:03:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1280a1eba4e0068e3de15e69c6275ac9 SHA-1: 44d1252ddaa35649d16cdcf239c371cb44391b82 SHA-256: 6a43ce6579deb76d8a9aaa438444453cbfc6f438cbb4af6e5eee4d938a3af746
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to a known malicious redirector infrastructure, specifically advertising 'robux hack generator' lures. The document body and heuristics confirm the intent is to trick users into visiting these sites, likely for credential harvesting or to download further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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.tw/app/431946152/robux-hack-generator-game-hack In PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/roblox-catalog-free_GM431946152.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/pubg-uc-myanmar_GM1330123889.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/free-bobux_GM431946152.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/cheat-engine-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/coin-master-free-spins-may-11-2021_GM406889139.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/roblox-hack-ninja-legends_GM431946152.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/bux-life-robux-free_GM431946152.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-human-verification-or-download_GM431946152.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/server-destroy-exploit-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/new-not-center-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/free-roblox-colouring-pictures_GM431946152.pdfIn PDF document text
    • https://www.theecobuild.com/uploaded_files/userfiles/files/get-free-robux-in-roblox-2021_GM431946152.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_off0000320d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x320D 22412 bytes
SHA-256: 13a28f69677ec017d95ebe335e0c79eec20dfaf8e4d1745d270806e6be2ae64b
font_01_sfnt_off000063d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63D4 18824 bytes
SHA-256: 6a2f4fb47bcac7a1427eb84fb186ae35d3638566a93e34d85c8a35338f058712

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