Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b7cd7988d98f3d3…

MALICIOUS

PDF

41.3 KB Created: 2021-05-12 13:42:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 08b39080d21d32f0d92a046596c16be6 SHA-1: 79c769d94ef774fc58c9f93719cfa2000fed2f44 SHA-256: 7b7cd7988d98f3d397e7a8d4c1b6e8d6b7f40925303f09eda6436e926934a465
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as "free generator" or "game hack" lures. The primary redirector URL is https://netcdn.xyz/app/431946152/how-do-you-get-free-roebucks-game-hack, which is likely used to deliver a second-stage payload. The document body and embedded URLs reinforce this theme, aiming to trick users into clicking through to a malicious site. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/how-do-you-get-free-roebucks-game-hack In PDF document text
    • https://jdclassicautoparts.com/image/data/files/how-to-hack-coin-master-root_GM406889139.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/coin-master-hack-tuts_GM406889139.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/regal-world-coin-master_GM406889139.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/hack-coin-master-apk-33_GM406889139.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/free-coin-master-account_GM406889139.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/coin-master-2021-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/minecraft-pe-hacked-client-download_GM479516143.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/free-roblox-codes_GM431946152.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/minecraft-tower-defense-hacked_GM479516143.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/coin-master-free-spins-link-2021-april_GM406889139.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/free-pet-food-coin-master_GM406889139.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/free-bling-bling-card-coin-master_GM406889139.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/free-vpn-for-minecraft_GM479516143.pdfIn PDF document text
    • https://jdclassicautoparts.com/image/data/files/free-robux-codes-no-human-verification_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_off00004705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4705 24244 bytes
SHA-256: 3ce8f0c3238375d78796f68368e0ca95f5da46687d9c46b82d14bb5f66bbdf36
font_01_sfnt_off00007e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E30 18572 bytes
SHA-256: 2ad3879de19ea59e0756335b6843f31f95ade4521f96ee42130de8f0f36df72d

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