Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8470377974c13d5…

MALICIOUS

PDF

43.7 KB Created: 2020-10-07 06:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 426b454b9020c9c656165e19db1bbd63 SHA-1: f4e0680033a8dccd32b3e42d87cf3dd23f1a8136 SHA-256: d8470377974c13d55ff16e72d5cdf9de7c63a4d7675813c036e3508c66a50e25
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a specific PDF document. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a link farm or phishing campaign.

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://cctraff.ru/strik?keyword=macit+g%25C3%25B6kberk+felsefe+tarihi+pdf In PDF document text
    • https://site-1036862.mozfiles.com/files/1036862/bexupegagopomurasifagegik.pdfIn PDF document text
    • https://site-1037268.mozfiles.com/files/1037268/wakinanugafupusiruxibom.pdfIn PDF document text
    • https://site-1038431.mozfiles.com/files/1038431/36222258156.pdfIn PDF document text
    • https://site-1042840.mozfiles.com/files/1042840/pevuwo.pdfIn PDF document text
    • https://site-1036880.mozfiles.com/files/1036880/99259014893.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/ebe59b7d-cf6f-47a6-a112-881eb1270b0d/dewebapekotok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/218d6006-ceb6-40d0-aade-615da9dd14db/92353747816.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3162a2de-3467-4d94-b711-e3e4792ecb26/lusalodinup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a18aa2a-a5c8-4d28-9e21-68ec5298383e/xirekogezapefizovaraf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2483/4982/files/towixapunozogitewiro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6602/7943/files/51862665802.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/5261/5830/files/complex_analysis_ahlfors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42d797a2-fbb5-441a-8858-f03d53108a82/58659963742.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/190f554a-a2c8-4c65-af3c-9276a86c6392/3516348559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cfcbb54-49ed-4486-a40a-9d73b6b7ec9a/sivufukoravel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4e919dd-69ea-499f-b0df-25a06402126f/86201110398.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_off00005be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BE9 5336 bytes
SHA-256: 35db92631abda2017f475633b5ae29f95f09b0ba492c14b0ade89273db2d7cfa
font_01_sfnt_off00006e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E23 11316 bytes
SHA-256: d14d4b2474fd103cb88b0fb114a8d4a74a308e573dbc88cdfb1ae9e615076257
font_02_sfnt_off000091a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91A1 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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