Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5922832aa6b0bb…

MALICIOUS

PDF

47.0 KB Created: 2021-06-02 15:59:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 51619ffb277727203b4ebfd1bde69264 SHA-1: 9d6d76dd30bd50c74f31085d54d8b6d27de4333c SHA-256: 9d5922832aa6b0bbeba1ee477f5f3fa8dd5681fa5fa82221dc38438b704a53ba
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites that appear to be part of a link farm or redirector infrastructure, designed to lure users with promises of free in-game items or hacks. The document body and heuristics indicate a strong focus on redirecting users to these scam-related URLs, likely for financial gain or to distribute further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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-to-get-free-money-in-roblox-adopt-me-game-hack In PDF document text
    • https://kierowcyhgv.uk/images/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/androeed-ru-minecraft_GM479516143.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/how-to-get-free-food-for-foxy-in-coin-master_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/coin-master-free-coins-link-facebook_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/pubg-uc-with-jazz-cash_GM1330123889.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-minecraft-windows-10-with-java_GM479516143.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-roblox-groups-with-funds_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-likes-for-tiktok_GM835599320.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-spin-link-for-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/coin-master-free-gold-cards-link_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/coin-master-free-spins-2021-haktuts_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004ddc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DDC 25780 bytes
SHA-256: 1a3af26b19c8c66bad689cdf9f37e5c11fc8a5b3569d9fccf44c15acc34645aa
font_01_sfnt_off00008929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8929 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off000092d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92D8 18940 bytes
SHA-256: 91687e22eaab639d8e39f45ba4fdc0805f58399589cceff1edc34947b15ee7b8

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