Malicious PDF — malware analysis report

Static analysis result for SHA-256 117925928c96b479…

MALICIOUS

PDF

43.5 KB Created: 2020-10-07 08:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4392e21b2e3ce60bcb70b4e5b32802b3 SHA-1: ac8ff07be90d3d5e3b1b3a72d8f96ab59124d196 SHA-256: 117925928c96b4792692a92ba6f34a5529a11b127bbbb5f1e2d5c8b29e8d8fcf
124 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to known malicious redirector infrastructure or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of malicious redirector links and a link farm on disposable hosting. The document body, though heavily obfuscated, contains URLs that are likely intended to lead the user to malicious sites, potentially 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 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://gettraff.ru/pify?keyword=heat+transfer+worksheet+answer+key+pdf In PDF document text
    • http://files.lh4biz.com/uploads/1/3/1/0/131070246/bupulino.pdfIn PDF document text
    • http://files.inlivingdreams.com/uploads/1/3/0/8/130813650/5f6d231eaa6695.pdfIn PDF document text
    • http://files.opeiu-local2.org/uploads/1/3/1/4/131482946/vajavowa.pdfIn PDF document text
    • http://files.dancerscornerlr.com/uploads/1/3/1/0/131070220/6b555.pdfIn PDF document text
    • http://files.tfhop.org/uploads/1/3/2/6/132681513/39aa9955b5b.pdfIn PDF document text
    • https://site-1040374.mozfiles.com/files/1040374/jatukupotedupe.pdfIn PDF document text
    • https://site-1040618.mozfiles.com/files/1040618/jubiza.pdfIn PDF document text
    • https://site-1043660.mozfiles.com/files/1043660/80719847544.pdfIn PDF document text
    • https://site-1038897.mozfiles.com/files/1038897/gutatalonolipixotirozo.pdfIn PDF document text
    • https://site-1043796.mozfiles.com/files/1043796/gotuxil.pdfIn PDF document text
    • https://site-1048473.mozfiles.com/files/1048473/4391049192.pdfIn PDF document text
    • https://site-1038948.mozfiles.com/files/1038948/dawega.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4d1ade49-aa30-43c6-a7ef-2e63334fb51c/1872780615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f884cd97-9cfc-49d9-bdac-cd1a8e99a6b2/takuvin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edd24c51-fb0d-41b4-8e4c-f16c7f809ef6/vewuxamizoxasolasiluni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5dcbbec-e525-4b19-9f91-91eb429abd2c/61650436115.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F93 5056 bytes
SHA-256: fe45dc7f28188b9d5176c15ae7866b1f156513efa86dda398cf1371ed87fbff5
font_01_sfnt_off000070cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70CC 9984 bytes
SHA-256: b7b8e65e9bd3874d305ae71c5a3b1005924137a22bef61de9bbece5a617c6c72
font_02_sfnt_off000092d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92D3 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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