Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf6932436c9848c…

MALICIOUS

PDF

45.5 KB Created: 2021-05-17 15:05:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3081a315a61b7b6d098932f04236be3d SHA-1: 09732312e19c7c2cc6902991db3aa82f51c75bc2 SHA-256: 1cf6932436c9848c3f8f46c97a4f0953c29b3e89350d4a945047cf2e15fc1c64
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, including a known malicious redirector. The document body and embedded links suggest a lure for game-related cheats or currency, a common tactic for malware distribution. The heuristic firings strongly indicate malicious redirector infrastructure and a link farm designed to attract traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/479516143/best-free-minecraft-server-hosting-game-hack In PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/buxblast-com-robux_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-online-hack-download_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-unlimited-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-game-hack-link_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-minecraft-addons_GM479516143.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/get-free-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-robux-exe_GM431946152.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_003_off00004dd3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DD3 24440 bytes
SHA-256: 75257a1c91d9d1d133720119c6000bf22ad234a5211a6fb025fea955586362d8
font_01_sfnt_off00008574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8574 2892 bytes
SHA-256: c2578a292634a901613c1dd9f9883dd4930e6811e59ae03d696f263e56ea17b4
font_02_sfnt_off00008f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F5E 18328 bytes
SHA-256: 0b2d28431e5234c57104fb234e5f183f246f5a4819408a3d571d7ab08b18c1e5

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