Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cdf20259da744c1…

MALICIOUS

PDF

45.4 KB Created: 2020-08-31 02:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60861585020e721dc05e7137473fb76f SHA-1: e27e13ac14dc2e3e104a33e76d982aaf1c061497 SHA-256: 6cdf20259da744c1f484b0ef6aa34a3f06935f2f9f67cf9b7ed27161bb17a43c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to benign Shopify URLs, but one critical link directs to a known malicious redirector. This suggests the document is part of a link farm or SEO manipulation scheme intended to distribute malware or lead users to malicious sites. No scripts were extracted, but the presence of malicious links is sufficient evidence of malicious intent.

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=pictionary+ideas+for+middle+schooler
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/7744/3483/files/216551558.pdf
    • https://cdn.shopify.com/s/files/1/0463/0803/2669/files/366366656.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96280370261.pdf
    • https://static.usrfiles.com/ugd/1b8612_31f1c32181394216ad4bb36f72d7ee62.pdf
    • https://static.usrfiles.com/ugd/c5d40f_f795c62518e84b038ade9bb62657f36f.pdf
    • https://static.usrfiles.com/ugd/b8c837_37ebca5215094a1cb1e566d6df96baff.pdf
    • https://static.usrfiles.com/ugd/ca300b_d56477734afd4b16ad87ee4ac35c72ef.pdf
    • https://static.usrfiles.com/ugd/c20ea7_59d7e9a5898043a7a543c7a64e904db2.pdf
    • https://static.usrfiles.com/ugd/078c79_f2491af960f545a985eaa7be534ad800.pdf
    • https://static.usrfiles.com/ugd/b8bbd7_a21d87fd14dd414a8d21d9ffc7ee1287.pdf
    • https://static.usrfiles.com/ugd/fac845_6cbc1fb0825e4407a8ac31877d79d1c4.pdf
    • https://static.usrfiles.com/ugd/6cfc61_2bf42c87b21649779cef93162cf4a5bc.pdf
    • https://cdn.shopify.com/s/files/1/0453/2230/5691/files/20201875052.pdf
    • https://cdn.shopify.com/s/files/1/0432/6549/1106/files/34131398750.pdf
    • https://cdn.shopify.com/s/files/1/0439/4264/1832/files/bringing_them_home_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/1471/7597/files/74475738038.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065cb.bin
def00f1ef3b5cc5ae8cd3621a1f664328752697c72b3d2fe167df2f93dc4328d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65CB 5152 bytes
font_01_sfnt_off0000771b.bin
5168e59a1121edfbf22ee7a17e42478597f982916c204c7e56e3be3c7fdeb975		 pdf-font-stream PDF embedded font (sfnt) at offset 0x771B 10680 bytes
font_02_sfnt_off00009aa2.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AA2 4324 bytes

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