Malicious PDF — malware analysis report

Static analysis result for SHA-256 7773127a3d7a1efa…

MALICIOUS

PDF

47.4 KB Created: 2020-08-17 15:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcefad61507de9524ffef94dee7b7efe SHA-1: 10535734ddc583d040119a4e7f24ed3375d0a230 SHA-256: 7773127a3d7a1efa043672ccb62575073b51a6f6543a68e184934dbfbbd2ef11
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 of which point to what appears to be a link farm designed to redirect users to malicious infrastructure. The primary redirector URL is identified as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect 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/pify?keyword=abbyy+finereader+9.+0+sprint
    • http://goporovit.dawnmader.com/uploads/1/3/1/0/131070786/8257385.pdf
    • http://xajujevez.greensportscamp.com/uploads/1/3/1/6/131636755/9684537.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0279/0039/files/puniribe.pdf
    • https://cdn.shopify.com/s/files/1/0432/3383/7224/files/16514797501.pdf
    • https://cdn.shopify.com/s/files/1/0430/6406/6201/files/halloween_coloring_pages_for_adults_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/6006/7480/files/ct_pistol_permit_application.pdf
    • https://cdn.shopify.com/s/files/1/0433/5665/1669/files/patofisiologi_urolithiasis.pdf
    • https://cdn.shopify.com/s/files/1/0431/0319/1193/files/fexizupugefobigobajiwadu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7355/2028/files/buxenalapufoma.pdf
    • https://cdn.shopify.com/s/files/1/0430/3519/7602/files/xabupoxaku.pdf
    • https://cdn.shopify.com/s/files/1/0443/4988/2524/files/psychology_and_sports_class_12.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/58012111984.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_off00007881.bin
1fb0c953b91d2a0906edab5ff4f1d2ba9d76e94d7405a754272bb11e57d40696
pdf-font-stream PDF embedded font (sfnt) at offset 0x7881 5564 bytes
font_01_sfnt_off00008b70.bin
a98044dce38a3eff3fd47111d3f3ff8153855461c1b219ed8607d40f66fd55c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B70 10972 bytes