Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5a3806c7ca67ac…

MALICIOUS

PDF

41.2 KB Created: 2020-08-29 14:40:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b79c4af31636985553ce9608c01268c6 SHA-1: 95b66f04cc99873cc027c428cb61de7759880a18 SHA-256: 7b5a3806c7ca67ac19c822114bb5b87648fcff85de5e8674e4dfe1b21b9fd3e4
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, many of which point to a link farm hosted on static.usrfiles.com. One of these links, https://ttraff.ru/wix?keyword=el+backyardigans+partido+en+mt+olymp, is identified as a malicious redirector. This suggests the document's primary purpose is to direct users to malicious infrastructure, likely for further exploitation or phishing.

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.ru/wix?keyword=el+backyardigans+partido+en+mt+olymp
    • https://cdn.shopify.com/s/files/1/0431/1479/1069/files/nuveki.pdf
    • https://cdn.shopify.com/s/files/1/0431/9825/1165/files/379870210.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/pedapugametu.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc25def020a549a4badb8957350bcc05.pdf
    • https://static.usrfiles.com/ugd/b8c837_6da7b54f7b7f46569769888c5aff26c1.pdf
    • https://static.usrfiles.com/ugd/79cb75_b45b225724e048808dda4fe412d195da.pdf
    • https://static.usrfiles.com/ugd/b8c837_41fb1171b37d41f0ac8fa0065015be32.pdf
    • https://static.usrfiles.com/ugd/0dd040_f2eefaf4667c41ac89814b76fd3051fd.pdf
    • https://cdn.shopify.com/s/files/1/0432/5280/9888/files/97415032480.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0850/files/feborejimunejalekoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/0210/0886/files/beelink_w95_android_7._1.pdf
    • https://cdn.shopify.com/s/files/1/0433/0458/3318/files/9064589061.pdf
    • https://static.usrfiles.com/ugd/b8c837_74c3717893964734b545cf26028f6726.pdf
    • https://static.usrfiles.com/ugd/3649d2_6fd54fcb0d204808a424ab562a133e6a.pdf
    • https://static.usrfiles.com/ugd/b8c837_8b7f2b0c200b401ea62610955f037079.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_off00006154.bin
b4db500f67b8057524c5dc074a3083c925dd7df9a906392386a28ae99d882e3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6154 5656 bytes
font_01_sfnt_off0000747c.bin
928bdfe66fda2c31eef35df5db2f71b0d7322639719f0538dfdeb20fb8aa3a98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x747C 10352 bytes

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