Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ed9bec70bc6da6…

MALICIOUS

PDF

45.5 KB Created: 2020-08-30 22:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3d65b312b7b99c8be55ebc52b7699c5 SHA-1: c059d1668f24fcf6bc802701546fc9073f00af55 SHA-256: 51ed9bec70bc6da69180389d1e1a9e791191d7e64592d4c8fe8928606a27cf23
150 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, suggesting an SEO manipulation or link farm tactic. The primary malicious URL identified is https://ttraff.cc/wix?keyword=atlas+de+orina+pdf. No scripts were extracted from this sample, and the document body was heavily obfuscated, making it difficult to determine the exact user-facing lure.

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=atlas+de+orina+pdf
    • https://cdn.shopify.com/s/files/1/0437/6598/9530/files/80925989357.pdf
    • https://cdn.shopify.com/s/files/1/0427/3537/0407/files/39965748288.pdf
    • https://cdn.shopify.com/s/files/1/0434/5144/9504/files/ascii_code_chart.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c6cbe1d631246d2b27c5c00f0925dff.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ce61f72d0114a4e804a390d3b526560.pdf
    • https://static.usrfiles.com/ugd/b8c837_6058219135d1484896c822688aac2bcc.pdf
    • https://static.usrfiles.com/ugd/b8c837_e90bf73675f04c30b8fc7ed03ca40738.pdf
    • https://static.usrfiles.com/ugd/2e16aa_40018bcc3f9540baa66c49ec31f712e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_7d0a4264b1b4400e996c6dcdbdfc7837.pdf
    • https://static.usrfiles.com/ugd/906e9f_f5532e506ac84d1fbb0432e9630aee82.pdf
    • https://static.usrfiles.com/ugd/b8c837_a7e8c56585f840e6b619c65076370ccf.pdf
    • https://static.usrfiles.com/ugd/95089d_fe1550bb0cad4f6ca03bf16e162da57c.pdf
    • https://static.usrfiles.com/ugd/913720_6c244d1cc8654516bcdf42638ac93d6b.pdf
    • https://static.usrfiles.com/ugd/b8c837_b71178487f704287a6a27ae5abc15c90.pdf
    • https://static.usrfiles.com/ugd/b8c837_f679f1acf09d43329bd606e0487b004e.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_off00006743.bin
575806d75a161fe051ba70fac80e954bda636d1ae1603e34363427ff17657b63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6743 5024 bytes
font_01_sfnt_off0000785f.bin
c25b8eb0283046c659bd8e608ab385e7c711c1a8685f699813ccea3ff97880dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x785F 15724 bytes

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