Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1e847f748a27db…

MALICIOUS

PDF

41.0 KB Created: 2020-09-30 03:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e0a6f8deb6d1fd857bc72c7c84724f0b SHA-1: ed4768b1a33b7dadfedea46aef80ab793a30419a SHA-256: 4d1e847f748a27dbeebdf18b562938c5186b9e64af932033e2d31cad5fbaedf6
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though obfuscated, contains URLs that are consistent with a phishing or malware distribution lure. No scripts were extracted, but the presence of malicious links suggests an attempt to redirect the user to a compromised site.

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://cctraff.ru/strik?keyword=basdai+score+pdf In PDF document text
    • https://site-1036956.mozfiles.com/files/1036956/39225645871.pdfIn PDF document text
    • https://site-1036923.mozfiles.com/files/1036923/80807366755.pdfIn PDF document text
    • https://site-1036938.mozfiles.com/files/1036938/volanutofepop.pdfIn PDF document text
    • https://site-1037077.mozfiles.com/files/1037077/wasogenigoz.pdfIn PDF document text
    • https://site-1037081.mozfiles.com/files/1037081/88096109996.pdfIn PDF document text
    • http://lipeke.helena-yang.com/uploads/1/3/2/7/132712416/8477879.pdfIn PDF document text
    • http://kelita.htmflagsprogram.org/uploads/1/3/1/8/131856373/6338774.pdfIn PDF document text
    • http://files.judenicholson.com/uploads/1/3/0/8/130874370/75c6c3c.pdfIn PDF document text
    • http://files.randolphlutheran.org/uploads/1/3/1/4/131407324/5ee2edfb2fd.pdfIn PDF document text
    • http://files.premierweb.org/uploads/1/3/1/4/131437862/2861824.pdfIn PDF document text
    • https://site-1037878.mozfiles.com/files/1037878/80631464087.pdfIn PDF document text
    • https://site-1036958.mozfiles.com/files/1036958/42896334449.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d1b60ed-3c0b-4188-b3e3-e3bb8e8549f7/kixawitodalitoxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34fad47f-c63e-4c28-93ec-447d4f3eaf5c/nazujejef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6bdbc85-6329-44ef-89e6-03c23a71d7bd/64814523512.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/345856d9-ccc6-4ff3-b9a8-d4729864b9ca/2669050187.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_off00006298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6298 5164 bytes
SHA-256: de467ddad2c6209454c2d995d3120b70a69aed70213979e4bf65984b173b286f
font_01_sfnt_off00007439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7439 10376 bytes
SHA-256: 0cbaca3771e4ea04f8f0208107a0e0759ed4efe4ae996388ae7ae89f667ab153

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