Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8550f20b7df618b…

MALICIOUS

PDF

34.1 KB Created: 2020-08-29 18:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3e28a49500ec9fa25d28a197a8db550 SHA-1: 2f424aa434b553713b0ab797b21c40e66e8cc68b SHA-256: c8550f20b7df618bf10b926ca073bbdcbcaa374c98d217b99637dba6c2ca850b
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a potential SEO manipulation or link farm tactic. The ML classifier also strongly flagged this PDF as malicious. The primary malicious URL identified is https://ttraff.com/wix?keyword=there%2527+s+a+girl+lyrics.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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/wix?keyword=there%2527+s+a+girl+lyrics
    • https://static.usrfiles.com/ugd/b8c837_3433511748414b0bb0f16530a5d1db0c.pdf
    • https://static.usrfiles.com/ugd/b8c837_61fcf48439874987a155b34eb34b9645.pdf
    • https://static.usrfiles.com/ugd/5b5da7_dcc57c938ea64d5391363cd9596728e1.pdf
    • https://cdn.shopify.com/s/files/1/0437/8365/1490/files/aleksandr_dugin_libros.pdf
    • https://cdn.shopify.com/s/files/1/0464/7613/2502/files/cordless_speakerphone_with_answering_machine.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/rowenowogu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6106/7428/files/brain_drain_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/59953154713.pdf
    • https://cdn.shopify.com/s/files/1/0434/1137/4230/files/xuwasogaz.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/76644144261.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/zowoziwobolafubapewaxok.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0295/files/61407522490.pdf
    • https://cdn.shopify.com/s/files/1/0429/7749/3146/files/lagu_balungan_kere_lirik.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/total_shoulder_arthroplasty_protocol.pdf
    • https://cdn.shopify.com/s/files/1/0438/8651/0232/files/88349507667.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_off00004924.bin
a4ee60a3ac652b6679b5e15f2e9e135a0c4a3967ccf357d3a1944990504cb1cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4924 5144 bytes
font_01_sfnt_off00005aaf.bin
87b2b952f8a882ee0980cde8fb2850c1df10bbbd12db1c7035ccaf8a78285cdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AAF 9776 bytes

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