Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2efbc57de68373…

MALICIOUS

PDF

43.1 KB Created: 2020-07-28 19:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9352f2271b410c55280372084a2d510 SHA-1: ff7999674482ffbaec625497052d1da25eb9feda SHA-256: 6b2efbc57de683739f4a58b4266d419a601c6f2e46ac187f5da6900819f3bfde
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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/pify?keyword=self+employment+ledger+template+pdf
    • http://files.armstrongsbeautysupplync.com/uploads/1/3/2/8/132814463/4874669.pdf
    • http://files.alicelimoges.com/uploads/1/3/0/8/130813897/jelapinojodexopeg.pdf
    • http://files.merredincrc.com/uploads/1/3/0/7/130738779/tukezazezir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9309/8660/files/bazeniwalege.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9444/files/34495095407.pdf
    • https://cdn.shopify.com/s/files/1/0434/4669/8146/files/86358491464.pdf
    • https://cdn.shopify.com/s/files/1/0431/6105/9482/files/vigilazazis.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/godikuka.pdf
    • https://cdn.shopify.com/s/files/1/0435/8474/9725/files/1746014358.pdf
    • https://cdn.shopify.com/s/files/1/0433/3685/9813/files/wimiromoxuvug.pdf
    • https://cdn.shopify.com/s/files/1/0429/9869/4049/files/73928957989.pdf
    • https://cdn.shopify.com/s/files/1/0432/1371/7662/files/75504264419.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_off00006d40.bin
10d3741cb2db0752733c0606ac0d768b507f9bb87d001782f24d2ae5c5b7d589
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D40 5128 bytes
font_01_sfnt_off00007e9b.bin
11d1f66382ab7282d8cbfbc823d0f1b8f2ea388624cf697139c2ec9fedad36d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E9B 9608 bytes