Malicious PDF — malware analysis report

Static analysis result for SHA-256 76693f79dd5dbf81…

MALICIOUS

PDF

41.2 KB Created: 2020-09-04 02:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00ea1450b929ba3803da05e5b25d4979 SHA-1: 2bd2287e6cc903d54e462428ad97b94c59903f31 SHA-256: 76693f79dd5dbf8173861d8e1784ff0f3ae8e21607c2e304fe5605b863c289ba
162 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body text, though garbled, suggests a lure related to 'tasks template excel', aligning with the 'Fake invoice / payment lure' heuristic. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm designed to distribute malicious content. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=tasks+template+excel
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7205/2643/files/sagifolotavinilitiz.pdf
    • https://cdn.shopify.com/s/files/1/0432/8148/1884/files/mathematics_for_economics_blume.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/38944467819.pdf
    • https://cdn.shopify.com/s/files/1/0457/3764/0092/files/download_film_dilan_1990_full_movie.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c6cbe1d631246d2b27c5c00f0925dff.pdf
    • https://static.usrfiles.com/ugd/ed2d23_3f6808a7bac14a7495cdb6a32ad1292a.pdf
    • https://static.usrfiles.com/ugd/1e32c2_06fa7b53b7f545379d29db8bf47da874.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0c0ceca269946ed84108e499f627310.pdf
    • https://static.usrfiles.com/ugd/cbe7f7_880e055ad7da44178bd900337bb47dcc.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_off00006466.bin
add88d33d9246988d3613024e13ff827df43e5a44205447f12c0759a5033d66a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6466 5064 bytes
font_01_sfnt_off0000759a.bin
442ccd167e83e66ef1940a370571f15301277e75d4a583e218966124f3b9dbc4
pdf-font-stream PDF embedded font (sfnt) at offset 0x759A 10332 bytes