Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1659fa44e2fc7a…

MALICIOUS

PDF

34.2 KB Created: 2020-08-20 12:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edb6508fd78afae8edc625b6b5388503 SHA-1: 3583b82f6c4d25c2b62ee73895cf168cc02993c1 SHA-256: bf1659fa44e2fc7ad15ce956279f696c6f349cd65b74cca5691435a2a62a1e1f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector infrastructure, specifically 'ttraff.cc', which is designed to lead users to malicious content. The PDF also hosts a large number of external links, many pointing to Shopify-hosted PDFs, suggesting a link farm or SEO manipulation tactic to distribute malicious content. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

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=the+fifth+wave+pdf+free
    • http://files.ndmnfundraising.com/uploads/1/3/0/9/130969545/padizipum-zoxosiv-fawipikewojogiz-gigar.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6863/files/miwidi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/texirid.pdf
    • https://cdn.shopify.com/s/files/1/0431/1531/5349/files/27001855104.pdf
    • https://cdn.shopify.com/s/files/1/0438/2215/3890/files/88154152913.pdf
    • https://cdn.shopify.com/s/files/1/0429/5173/7498/files/zobizamabotisaru.pdf
    • https://cdn.shopify.com/s/files/1/0440/0267/2798/files/48373156353.pdf
    • https://cdn.shopify.com/s/files/1/0434/1992/6679/files/orchitis_usu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3583/6072/files/merosulesapowifuvajoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/1321/8210/files/99512743497.pdf
    • https://cdn.shopify.com/s/files/1/0434/4279/8757/files/bash_script_for_speed_test.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/555_timer_as_bistable_multivibrator.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004544.bin
0924f45250442b02bbb6ec3fbd3fb4a23db48798b77f60ad790e1e6bc88f10e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x4544 5020 bytes
font_01_sfnt_off00005669.bin
a30fa09f16c221730726c9ebc81e1069a43286921b9e51af1e8eb605dd83ac87
pdf-font-stream PDF embedded font (sfnt) at offset 0x5669 10624 bytes