Malicious PDF — malware analysis report

Static analysis result for SHA-256 104f67c93ca37fed…

MALICIOUS

PDF

51.5 KB Created: 2020-08-31 05:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb7c5cd6ccb53a0e6b71cf5441b0dd9f SHA-1: f0ea262ca4063982eebcf609137062f39bfaf725 SHA-256: 104f67c93ca37fed73cb768f35cac6365f213990da07b86d13b46ab17f9652cd
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.ru/wix?keyword=resumen+del+primer+capitulo+de+la+en, is flagged as a malicious redirector. The document also exhibits characteristics of a link farm, with numerous external PDF links. While no scripts were explicitly extracted, the PDF structure and malicious link suggest an attempt to lure users to malicious content, likely for phishing or malware distribution.

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=resumen+del+primer+capitulo+de+la+en
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7070/8125/files/62932267004.pdf
    • https://cdn.shopify.com/s/files/1/0428/2816/9382/files/wixoxak.pdf
    • https://cdn.shopify.com/s/files/1/0432/5192/5155/files/doputebufopepifo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/accounting_standards_list_with_explanation.pdf
    • https://cdn.shopify.com/s/files/1/0429/2132/8807/files/ribizupekizoxepibukemup.pdf
    • https://static.usrfiles.com/ugd/80bfa9_6080c5272dd5473eb24d9cc1213272e3.pdf
    • https://cdn.shopify.com/s/files/1/0438/2395/6125/files/8310381126.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/archival_research_methodology.pdf
    • https://static.usrfiles.com/ugd/c63dba_7ead0039e11347bb865f4c2aace45fcd.pdf
    • https://static.usrfiles.com/ugd/b8c837_762337e21b2b4b40bb75596da384d484.pdf
    • https://static.usrfiles.com/ugd/b8c837_b78f99b4222b4a828ab3645a0b5c9f49.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_off00008b2f.bin
d241edf1c561aa94ac55f62adaf6288bb6fb542ac01e742ed54ed90a0ad8a0e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B2F 5228 bytes
font_01_sfnt_off00009cd4.bin
50252dd4607c585ea5edf7affaca1877977776673db89c9839367c4ba1a0aeda
pdf-font-stream PDF embedded font (sfnt) at offset 0x9CD4 10768 bytes