Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd748aa8355b2a2…

MALICIOUS

PDF

57.9 KB Created: 2020-09-01 17:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: adc8126b56348e6fe7041fa7c3af3088 SHA-1: 6d00b5c81851ce20da92244f5af4244afbece880 SHA-256: 4cd748aa8355b2a20062447c8fc0522d57ffb25341e6c164ae793dd4144541b0
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=geological+processes+and+hazards+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including one to 'https://cdn.shopify.com/s/files/1/0429/2775/1321/files/xebirisusuduze.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to contain the malicious URL.

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.cc/wix?keyword=geological+processes+and+hazards+pdf
    • https://cdn.shopify.com/s/files/1/0429/2775/1321/files/xebirisusuduze.pdf
    • https://cdn.shopify.com/s/files/1/0435/8438/9275/files/82645281659.pdf
    • https://cdn.shopify.com/s/files/1/0428/4894/4295/files/vebipevumimebona.pdf
    • https://cdn.shopify.com/s/files/1/0432/4386/4228/files/xilujuxopixofakobexax.pdf
    • https://cdn.shopify.com/s/files/1/0431/1282/4993/files/5470277938.pdf
    • https://static.usrfiles.com/ugd/7836c9_bbdb27679a8444c7a32fc021e255f8e9.pdf
    • https://static.usrfiles.com/ugd/1decf9_09123cdec9bf4335a225aa2537bbff6d.pdf
    • https://static.usrfiles.com/ugd/33a16d_b13945742bd24cb1ada3d0dae0b0e819.pdf
    • https://static.usrfiles.com/ugd/f4de5e_a238d2cf6fd34012a3a133a8e5ed5fd3.pdf
    • https://static.usrfiles.com/ugd/0582e0_659cb5df3ffe4e56b3f1acf9490c0cd2.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5275/files/18462347279.pdf
    • https://cdn.shopify.com/s/files/1/0454/7041/7046/files/19576313052.pdf
    • https://cdn.shopify.com/s/files/1/0437/3502/3765/files/love_and_other_drugs_full_movie.pdf
    • https://cdn.shopify.com/s/files/1/0428/6310/0070/files/81784895582.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/
    • https://cdn.shopify.com/s/files/1/043

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a4b0.bin
bc9ea329de0a68cde4ec69f8398371dbd6ccca7d1a65e6ce130e4e2dbbdd7a83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4B0 5496 bytes
font_01_sfnt_off0000b76a.bin
a08d323d3ed318ff59cd3e1f69778b195424a24e1918a1a247094d3c530004d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB76A 10360 bytes

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