Malicious PDF — malware analysis report

Static analysis result for SHA-256 52728dd74588f449…

MALICIOUS

PDF

48.7 KB Created: 2020-08-30 02:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05c3a0c84b73239ae24f3567b4f74985 SHA-1: 9159474060074441a84055edd90c477ab24db7cb SHA-256: 52728dd74588f4497cf15a97f7a2de946ba5f72aa78ef42a397cf525c308f4f9
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=death+be+not+proud+a+memoir+by+john'. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of a large number of external PDF links, many pointing to 'static.usrfiles.com', indicates a link farm strategy, likely to improve search engine ranking and distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=death+be+not+proud+a+memoir+by+john
    • https://static.usrfiles.com/ugd/b8c837_0b6596033ebe41459a3f3a90c3985e06.pdf
    • https://static.usrfiles.com/ugd/097bd5_67c0380c9fd34ac0a71130a302ee0c31.pdf
    • https://static.usrfiles.com/ugd/238140_54e97328d4ee48969d197bacb2911885.pdf
    • https://static.usrfiles.com/ugd/b8c837_2e3a30113151436e925358d05a45388e.pdf
    • https://static.usrfiles.com/ugd/5ed537_fb498888523947d9a8690bf5ff4a13ed.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fe25d6526324c378ceb3e72ea834f89.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_577f58080b894a37ad9544ddf460c2d1.pdf
    • https://cdn.shopify.com/s/files/1/0428/2161/5775/files/20746760987.pdf
    • https://cdn.shopify.com/s/files/1/0457/4652/0220/files/kisaxopenoladavi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7264/2460/files/telegraph_avenue_michael_chabon.pdf
    • https://cdn.shopify.com/s/files/1/0440/7384/4888/files/nigomev.pdf
    • https://cdn.shopify.com/s/files/1/0438/6373/6485/files/42_amendment_act_1976.pdf
    • https://cdn.shopify.com/s/files/1/0431/8255/5300/files/sowujunoduzaj.pdf
    • https://cdn.shopify.com/s/files/1/0438/5934/5573/files/monstrosities_dnd_5e.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_off000075a5.bin
58ee9aa6f02d9161a5e307b53c9a23cb7b9ae07b0c909e1d1126fb7c9bf75be1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75A5 5304 bytes
font_01_sfnt_off00008783.bin
09286532bdfbbbf3cb6f2d5f6f2fda062ddd0c4692c3487d4ff82ddb2a7e9fe4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8783 15040 bytes

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