Malicious PDF — malware analysis report

Static analysis result for SHA-256 3effdbc354bbd36d…

MALICIOUS

PDF

36.8 KB Created: 2020-08-18 17:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e1ccb5d7b74c778e912f4db5397edab SHA-1: a90e787c621baa8c28e1471b24caeb932a868a11 SHA-256: 3effdbc354bbd36d052ef97ed01adc33fc0a836636ab7561a785cd08b118e207
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains multiple embedded links, with a critical heuristic firing for a malicious redirector. The document body, though partially corrupted, contains text referencing 'Pennywise clown wallpaper' and a URL that aligns with the malicious redirector heuristic. This suggests the document's primary purpose is to trick users into visiting the malicious URL, likely leading to further compromise.

Heuristics 3

  • 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.
  • 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://ttraff.com/pify?keyword=pennywise+clown+wallpaper
    • http://files.shiningstarva.com/uploads/1/3/1/4/131454172/1901447.pdf
    • http://files.ericphotography.net/uploads/1/3/0/8/130814208/kusefunetuf.pdf
    • https://cdn.shopify.com/s/files/1/0438/3742/3776/files/bujamaluwabu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1261/1481/files/learn_english_grammar_through_tamil_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/1958/3138/files/fenusajitov.pdf
    • https://cdn.shopify.com/s/files/1/0431/9769/4109/files/metodos_anticonceptivos_femeninos.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/xunepenukoxutupavoxu.pdf
    • https://cdn.shopify.com/s/files/1/0436/2154/8194/files/gudusemasogedogawanonu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6380/3040/files/xozolanerana.pdf
    • https://cdn.shopify.com/s/files/1/0433/5111/3887/files/using_calibre_to_convert_kindle_to.pdf
    • https://cdn.shopify.com/s/files/1/0433/1818/2041/files/reliance_annual_report_2020.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b0b.bin
fd1431c81c3cab05eaa2e684cfedf5d9c6049fd388888aeea828d689bf65fa1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B0B 5124 bytes
font_01_sfnt_off00005c99.bin
a3b3373d744d4a0facd845a3ddcdd626b5d29fe2e81dad43c790ac917a506d26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C99 13300 bytes

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