Malicious PDF — malware analysis report

Static analysis result for SHA-256 785f4cdf03e47716…

MALICIOUS

PDF

38.3 KB Created: 2020-07-09 03:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 674b95ae8ba370515bd20f4f37f5b8fd SHA-1: ab8c792968caf264cae9b0191c337eb742c6ebd5 SHA-256: 785f4cdf03e47716ccccb2a2c6fee49ddf025cee9cb683d3d939cdda1a0d576f
184 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, masquerading as search results for academic papers, which is indicative of a link farm or SEO spam campaign. The primary link directs to a known malicious redirector, suggesting an attempt to lead users to harmful content. The document body itself is heavily obfuscated and contains metadata from wkhtmltopdf, but the presence of numerous external links is the most significant finding.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wb?keyword=history%20of%20western%20art%205th%20edition%20pdf In PDF document text
    • http://files.ultimatefrisbeenow.com/uploads/1/3/1/4/131482926/2791022.pdfIn PDF document text
    • http://files.ferrari275club.com/uploads/1/3/0/8/130813546/fujusojexini.pdfIn PDF document text
    • http://files.sheisblankspace.com/uploads/1/3/0/7/130776826/golegudeg.pdfIn PDF document text
    • http://files.idagroverec.org/uploads/1/3/0/7/130739315/7532358.pdfIn PDF document text
    • http://files.saujs.co.za/uploads/1/3/2/6/132681824/8694376.pdfIn PDF document text
    • http://files.worldreadyschools.com/uploads/1/3/0/9/130969907/palirumopavatej-nitiz-diloxomagusap.pdfIn PDF document text
    • http://files.biomedregulatory.com/uploads/1/3/2/7/132741181/mokewax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://wewerodufo.files.wordpress.com/2020/07/87006359341.pdfIn PDF document text
    • https://zixuzutufu.files.wordpress.com/2020/07/kakijuzewopewarizimato.pdfIn PDF document text
    • https://resudixam.files.wordpress.com/2020/07/fuxavuzazegakifimezujo.pdfIn PDF document text
    • https://sekejodi.files.wordpress.com/2020/06/73846452304.pdfIn PDF document text
    • https://mugitemos.files.wordpress.com/2020/06/97584744911.pdfIn PDF document text
    • https://tutujored.files.wordpress.com/2020/07/wunikidemaf.pdfIn PDF document text
    • https://toxowufusa406561940.files.wordpress.com/2020/07/68623499525.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84113106953.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13977390730.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tolipokegegami.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gidawibozifuniji.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58B2 5164 bytes
SHA-256: ca48f55f82aec2f189d36bcc4f87115f892b382f7c30e9b790937258d0c30855
font_01_sfnt_off00006a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A4E 9996 bytes
SHA-256: 1b35d52bc765b2fd98b9f1a652f646c4e88296abd15fd3a600ab7d0fad79cd29

Open this report in the interactive analyzer, or submit your own file for analysis.