Malicious PDF — malware analysis report

Static analysis result for SHA-256 343ffd422c26aca9…

MALICIOUS

PDF

45.4 KB Created: 2020-08-31 19:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d53e1434ee72b850864731ef6068f78 SHA-1: dadfb4e585815f4ecf1dc21e8eeccec446d4f7b7 SHA-256: 343ffd422c26aca9814eada0463543a745b253a981bbd02ecf3f6968dab141b0
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.com/wix?keyword=duckpin+bowling+score+sheet, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a score sheet, likely a lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious.

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.com/wix?keyword=duckpin+bowling+score+sheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6085/3912/files/bitibododujawurevanurivas.pdf
    • https://cdn.shopify.com/s/files/1/0434/2009/0517/files/bifaxodegotevavulo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3998/0710/files/accident_report_case_number_florida.pdf
    • https://cdn.shopify.com/s/files/1/0436/8800/1689/files/11520486293.pdf
    • https://cdn.shopify.com/s/files/1/0437/4449/3720/files/54690099807.pdf
    • https://cdn.shopify.com/s/files/1/0429/2991/4012/files/d_d_scholar_s_pack.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40369191557.pdf
    • https://cdn.shopify.com/s/files/1/0457/5831/6700/files/basics_of_serial_communication.pdf
    • https://static.usrfiles.com/ugd/1d64af_fe1518b6bebc4745b69172d48fa60c0d.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb823b2bf3bf42fab79ae2377cbac88d.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_72a96fbb52564265bcc792afa04933e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1650010c74a4b21bfcd43e6d698b70b.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_00cd1d59d4344754aa08d8cfb4fdbd25.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_off0000738c.bin
922641eac5bbed3e976637b9612eee0f437b8877959243cda55e62cc2582ddb6
pdf-font-stream PDF embedded font (sfnt) at offset 0x738C 5280 bytes
font_01_sfnt_off0000859c.bin
f75dede8dd65dc88e2b9274a78b6613cdef9d39fa7bdeb923bb51ab7af20a1b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x859C 10424 bytes