Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e28b40aa04c591…

MALICIOUS

PDF

40.6 KB Created: 2020-08-02 21:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1263892735d7de3d59ff76b60e99a9a SHA-1: d6f21c0774c46ed81cbbc05040546ddea6f161dd SHA-256: 86e28b40aa04c591534b13855ad0cb9b6a6c1bf4e075426a8455e9954b77f2c6
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 pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to potentially harmful content, aligning with a phishing or malicious redirection attack pattern.

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.cc/pify?keyword=but+it+is+not+this+day+meme
    • http://files.divreitorahofvien.com/uploads/1/3/0/9/130969831/dewimo_vuranafitumapop.pdf
    • http://files.jgcsalesclinics.com/uploads/1/3/2/3/132302924/0c53db.pdf
    • http://files.firelightdesigns.net/uploads/1/3/0/7/130775747/tobubugumilev.pdf
    • http://files.kiefferphotography.com/uploads/1/3/2/7/132740852/196e24.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/0067/3950/files/95061009531.pdf
    • https://cdn.shopify.com/s/files/1/0430/8113/8343/files/dakezoxupotugu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3313/2193/files/zavojonukorux.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/danedogorolulefumatexa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lunizededalusabunis.pdf
    • https://cdn.shopify.com/s/files/1/0431/1089/1680/files/3884135503.pdf
    • https://cdn.shopify.com/s/files/1/0432/9776/7592/files/31470103917.pdf
    • https://cdn.shopify.com/s/files/1/0440/4409/1557/files/32135466940.pdf
    • https://cdn.shopify.com/s/files/1/0439/1151/2232/files/mevuxikufekasox.pdf
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/25621988427.pdf
    • https://cdn.shopify.com/s/files/1/0433/9207/3895/files/coffee_break_french_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/5487/2214/files/8231978083.pdf
    • https://cdn.shopify.com/s/files/1/0434/6924/2534/files/39123869600.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_off00006168.bin
a6e69823569ae705822e0157637aad053e3044fdda84b591c1d293c014945e72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6168 5088 bytes
font_01_sfnt_off0000729b.bin
004f64bf5414eb690991ea34cd38da81ff94ed48ade40d20ef48e99807512dbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x729B 10456 bytes

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