Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a7a07abb3dee94…

MALICIOUS

PDF

39.9 KB Created: 2020-08-31 20:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52fa85b61247ad9fe63320514ba15813 SHA-1: 402bfc40a4ce36288c57b735d94a8ff5de0543ea SHA-256: 73a7a07abb3dee94a90b88d927e0a76b3c2d5266c13d637eab9af7236c081939
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, a technique often used for SEO link farms or to redirect users to malicious sites. One of the primary links, 'https://ttraff.ru/wix?keyword=decision+pugh+matrix+template+format', is flagged as a known malicious redirector. The document body, though heavily obfuscated, appears to contain text related to templates and the malicious URL, suggesting a lure to trick users into clicking the malicious link.

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.ru/wix?keyword=decision+pugh+matrix+template+format
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9005/9176/files/44550061007.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/15544526088.pdf
    • https://cdn.shopify.com/s/files/1/0437/2188/3816/files/afterwards_formal_synonym.pdf
    • https://static.usrfiles.com/ugd/b8c837_b4ddae6f16c24df8802168dbf9c83dd1.pdf
    • https://static.usrfiles.com/ugd/ca300b_4ef0dc512e8f471b9bcda8c259b40d5b.pdf
    • https://static.usrfiles.com/ugd/3e9e83_51b7e8fa77d44d05a81f3ffd39cf4732.pdf
    • https://static.usrfiles.com/ugd/2f7815_255a6e9301ee470593dbd429418dbbb9.pdf
    • https://static.usrfiles.com/ugd/b8c837_d338ef3bfea54650b258c3a3c51d4b70.pdf
    • https://static.usrfiles.com/ugd/b88e3d_330e89f9f8f64c52aaff42ff34a46c1a.pdf
    • https://static.usrfiles.com/ugd/4b68be_a05a293d49d247ccbca50ecceff6f05d.pdf
    • https://static.usrfiles.com/ugd/b8c837_1dcce9e24629473e9e374a9c32e7160e.pdf
    • https://cdn.shopify.com/s/files/1/0432/9691/5621/files/10877613597.pdf
    • https://cdn.shopify.com/s/files/1/0428/3485/4051/files/wobemabekapobepub.pdf
    • https://cdn.shopify.com/s/files/1/0432/0509/9675/files/principles_of_chemical_processes.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/86276982816.pdf
    • https://cdn.shopify.com/s/files/1/0435/6125/5073/files/1365020261.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d61.bin
330bbad29062cfd780416b811c9999bb639a70390f70ffafe53e281b68ba2d0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D61 5496 bytes
font_01_sfnt_off00006ff6.bin
770619586b6469df17a81fad51701bb04d070d2460850ba625c1a9531f707114		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF6 10184 bytes

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