Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9216ebe5c3884a…

MALICIOUS

PDF

40.9 KB Created: 2020-09-02 16:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9176be8b427ea05bab0bb36bbb72e37d SHA-1: 8db5853e7f0bac061324db7fcf94c3fdfaaa583c SHA-256: 8b9216ebe5c3884a49fde7affa1d80bef961cb875b45656a8767df994ee75a74
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to a URL that appears to be a lure for 'how to spotify onto macbook'. The document body, though heavily obfuscated, contains the same URL and a reference to wkhtmltopdf, suggesting it's a generated PDF. The presence of a PDF link farm heuristic further indicates malicious intent to distribute links.

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.link/wix?keyword=how+to++spotify+onto+macbook
    • https://static.usrfiles.com/ugd/89064d_148c1ef8c65745bbab513117bcdc5080.pdf
    • https://static.usrfiles.com/ugd/285be4_18a39275c8f44a9c9eb0948cffd506ba.pdf
    • https://static.usrfiles.com/ugd/26938b_54ef34994fcd4ae19ebfe0b35bcd24ae.pdf
    • https://cdn.shopify.com/s/files/1/0439/5152/1947/files/bcs_preliminary_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/8073/6156/files/bosewipuve.pdf
    • https://cdn.shopify.com/s/files/1/0431/5771/7143/files/argento_vivo_daniele_silvestri.pdf
    • https://static.usrfiles.com/ugd/8c2e83_d5b7250521e04d199f4d283369bc2a4d.pdf
    • https://static.usrfiles.com/ugd/51c472_d48e078838624aaa9aa7200b76352fb5.pdf
    • https://static.usrfiles.com/ugd/a18aa6_c38bd8910f8c449ea7c8fec15f46915f.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_off0000628b.bin
3732398f1935d9c4350e935f9ad9d2191cd4baa00c7aaeca39d6adbbdfbcb43a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x628B 5392 bytes
font_01_sfnt_off000074eb.bin
b8168196d096d2f8790c3864e7f4f5a1a22d1e6f330b2e31164c69a7048876d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74EB 9996 bytes

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