Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0cf0074ea4fdd9f…

MALICIOUS

PDF

39.4 KB Created: 2020-09-01 20:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1243f78fb6041aec4aeaa23c3e425fbe SHA-1: 4c84943baa7e86eff6fc64fd868bb1a1fab26d71 SHA-256: c0cf0074ea4fdd9fcd20ef5f32a6987a1d21795ce64ee1c4b46d3cb57749eb99
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised as information about baby sleeping bag temperature guidelines. The document also features a large number of embedded links to other PDFs hosted on static.usrfiles.com, suggesting a link farm or redirection strategy. The ML classifier strongly indicated maliciousness, and the presence of multiple external links points to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=baby+sleeping+bag+temperature+guidelines
    • https://static.usrfiles.com/ugd/12f4eb_e405eb22b5864ba6989501ed0a6e0c20.pdf
    • https://static.usrfiles.com/ugd/a298ce_b00973d0fff44882a1f911290c1de352.pdf
    • https://static.usrfiles.com/ugd/b8c837_48cf34bcc8344ce7b2b7ad903e84a5ca.pdf
    • https://static.usrfiles.com/ugd/8c0e65_3748668aaf814976b9a4f0fa5a8c5d19.pdf
    • https://static.usrfiles.com/ugd/c5d40f_06098cd767694553bef5502e470a8d1d.pdf
    • https://cdn.shopify.com/s/files/1/0427/6345/2583/files/tadez.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dijupabexapuvasazanuripik.pdf
    • https://cdn.shopify.com/s/files/1/0438/0069/0845/files/fowajonafobep.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9080/files/18803948058.pdf
    • https://static.usrfiles.com/ugd/76de1a_1583dad23bfc493ba9b72c3cf538f161.pdf
    • https://static.usrfiles.com/ugd/b8c837_b62ce61e7b49492f9187ab3132f7c316.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_off00005bf1.bin
dcb61fa8ce01c1b5f12541f079a7dfcacbfea640b9cd7346fb30eac767860dfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF1 5572 bytes
font_01_sfnt_off00006ec7.bin
b2a65bcaeff5a08c37b09fb9ffe42e5fd494b7c0c0139dacff9ab060414b9018		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC7 10044 bytes

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