Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d5ea8dfb69bd96…

MALICIOUS

PDF

40.6 KB Created: 2020-10-03 11:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d6f246a427830d3b8ffcb40a21ed7800 SHA-1: 6aaeb813ed6c2ed693dcb41f7c52ee4202b0a1c2 SHA-256: f7d5ea8dfb69bd967e4cc6927b202526598b6f21dfe61e7f9db9e09affedbd74
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a link farm, ultimately pointing to potentially malicious content. The document body, though heavily obfuscated, contains a URL that matches the primary redirector found in the heuristics, suggesting a lure for downloading further payloads. The ML classifier also strongly indicated maliciousness.

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 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.link/pify?keyword=webelos+leader+guide+2015+pdf+free+download In PDF document text
    • https://site-1037177.mozfiles.com/files/1037177/finozipuxowakeg.pdfIn PDF document text
    • https://site-1037152.mozfiles.com/files/1037152/bibovod.pdfIn PDF document text
    • https://site-1036821.mozfiles.com/files/1036821/fupudovenuse.pdfIn PDF document text
    • http://files.joshuastringerartist.com/uploads/1/3/1/4/131406442/8751098.pdfIn PDF document text
    • http://jawiki.loganahlersphotography.com/uploads/1/3/1/4/131409200/e40edf8c59.pdfIn PDF document text
    • http://begupu.newwoodturners.org/uploads/1/3/2/7/132740267/zoboregekalamojaba.pdfIn PDF document text
    • http://files.clanchildhealth.org/uploads/1/3/1/4/131452997/dagewugojoma.pdfIn PDF document text
    • http://files.postopweekly.com/uploads/1/3/2/8/132815298/pukijosolawudew-xusadigagixu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0721/6280/files/68284738483.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/2240/0674/files/microsoft_windows_search_filter_host_windows_10.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6040 5904 bytes
SHA-256: 7664f4d4e2665e5122a3123fd63bb6510650966fd57d3e132fb528b421dac3b5
font_01_sfnt_off0000747f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x747F 9732 bytes
SHA-256: ac86eeafa638c52f0b17307bb76867e50af8b9896c5c1e3fa1332a478edb5851

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