Malicious PDF — malware analysis report

Static analysis result for SHA-256 b376e88c85334dbd…

MALICIOUS

PDF

39.4 KB Created: 2020-09-08 21:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a929cd0e7d051b18470d95c84623189c SHA-1: bbf5b656b3222f0f2ad81829ac95a25b77468659 SHA-256: b376e88c85334dbd1b98ec06123a5cf7e646a51718da2596b721246f01402811
150 Risk Score

Malware Insights

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

The PDF was flagged for containing a malicious redirector link and a link farm. The embedded URL points to a suspicious domain that is likely used to host phishing content or distribute malware. The document body, though heavily obfuscated, contains the same suspicious URL, reinforcing the malicious intent. No scripts were extracted from this sample.

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.club/wix?keyword=veterans+day+coloring+sheets+printable
    • https://static.usrfiles.com/ugd/cec570_772630aae37e4ce1b2bce88dd6818663.pdf
    • https://static.usrfiles.com/ugd/b8c837_db3253c0efc7482b895a918465f5b309.pdf
    • https://static.usrfiles.com/ugd/be19e1_474712dde4dd402e85a0724321b3a6fd.pdf
    • https://static.usrfiles.com/ugd/e3325f_502615c0e70a48a3b42850ca415d7659.pdf
    • https://cdn.shopify.com/s/files/1/0462/7346/2434/files/56571001411.pdf
    • https://cdn.shopify.com/s/files/1/0448/6758/4162/files/rrb_ntpc_cen_01_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/6329/5646/files/my_talking_tom_2_apk_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/5573/5203/files/burepawafanixe.pdf
    • https://cdn.shopify.com/s/files/1/0462/6913/7045/files/18233851472.pdf
    • https://cdn.shopify.com/s/files/1/0431/1498/7682/files/test_network_performance.pdf
    • https://cdn.shopify.com/s/files/1/0429/3178/1791/files/punekatunefutemika.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c19.bin
766fbac7aa845b55d6c8ed3959e90a05c8db56e6aed000631e2b21ba9dec90df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C19 5540 bytes
font_01_sfnt_off00006ee6.bin
6d93adeb9b376c2e21762a9a11d40d1c58f7d74a8664f2d42859804a4c12697f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE6 9932 bytes

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