Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb94ffce4bbc282…

MALICIOUS

PDF

35.0 KB Created: 2020-08-29 08:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad894fc698f4777c004e8007db6471b4 SHA-1: 9c71a4268f22176499d4527be862dda0db47953b SHA-256: bcb94ffce4bbc28224529d428144a81e4be6764a3b74db829ea016c2159c1c0b
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 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL and appears to be a lure related to 'Rudolph the red nosed reindeer sheet music violin'. The presence of a large number of embedded links, many pointing to Shopify, suggests a link farm or SEO poisoning tactic to obscure the malicious redirector. The ML classifier also strongly indicated maliciousness.

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=rudolph+the+red+nosed+reindeer+sheet+music+violin
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/taridulozomoxekolakinuku.pdf
    • https://cdn.shopify.com/s/files/1/0429/4914/8828/files/rozewuleluluxekewowerubun.pdf
    • https://cdn.shopify.com/s/files/1/0432/4642/0136/files/buzovarirevomubutejuto.pdf
    • https://cdn.shopify.com/s/files/1/0439/4627/9080/files/58405195564.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd09ff8b39dc45ffbba8d63e1564af44.pdf
    • https://static.usrfiles.com/ugd/b8c837_1222179c8d6948a5a40eb6c91c9f5962.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c110e82de454fb2bef28a9e1e904a6a.pdf
    • https://static.usrfiles.com/ugd/b8c837_bcdba029e50f433c80ea3aa3731eb84a.pdf
    • https://static.usrfiles.com/ugd/b8c837_9010707b508d4fe29e5c843adfd177c3.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_off00004b18.bin
ca816d6f2c028e614e50f4326b392e6bcd89a2ccd6dd6f7275963c276b166da2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B18 5168 bytes
font_01_sfnt_off00005c8c.bin
a6feb5704f0f2943890fbc4c5f9ef03ef54feb3f4a491d178d1b9ac687cb03b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C8C 10092 bytes

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