Malicious PDF — malware analysis report

Static analysis result for SHA-256 885abf90ea624645…

MALICIOUS

PDF

51.7 KB Created: 2020-10-27 08:13:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 4cbb93f74ea30825c7f61cf966cef635 SHA-1: 511c0d196b4c8391a2fcfebc4967a8abfe2b55c6 SHA-256: 885abf90ea6246453c8834054d29d892023381dd484a7f7836ac1ab294f3f5ed
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to suspicious domains and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and critical heuristics confirm the malicious nature of the PDF, specifically flagging it as a redirector and link farm. The document body, though heavily obfuscated, contains URLs that are also present in the heuristic findings, reinforcing the attack pattern.

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://ggtraff.ru/strik?keyword=nate+berkus+the+things+that+matter+pdf In PDF document text
    • https://sisaseno.weebly.com/uploads/1/3/0/7/130776680/jatis-tovojokenu.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/tadib-pepalitegugoj.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/4045700.pdfIn PDF document text
    • https://funogumoduwe.weebly.com/uploads/1/3/4/3/134309977/9202465.pdfIn PDF document text
    • https://suzaruluzi.weebly.com/uploads/1/3/4/4/134455671/dakusovepugewuv-bonupiges-gudikanoraxaje-rubetuzos.pdfIn PDF document text
    • https://kusanogiwaxug.weebly.com/uploads/1/3/0/8/130873987/jukitugeze-lokirofobago-bizamuzeza-momiwagozuxu.pdfIn PDF document text
    • https://kawigijutugin.weebly.com/uploads/1/3/4/3/134351661/3135713.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/2697538.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f92f23762b29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420434/normal_5f962aec8b1d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378153/normal_5f970883af7d2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fasanag/48507092094.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/lala_ramswaroop_ramnarayan_calendar_2019_download.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/affiliate_marketing_books.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/angielski_dla_pocztkujcych_i_redniozaawansowanych_a1-_b1.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/buxiwalorure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9f680c3-5172-4a0b-8c4f-16b7a886a2af/9729807315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7b06712-8913-4569-a430-ed498d436041/elite_dangerous_turret_mining_laser.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05d0913a-eaf5-4297-a29d-c0464e50a027/dosefavuzusenep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/379e9649-a2d3-40ce-b5cd-511eaf7c64fc/11471560768.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_off000088fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88FD 5596 bytes
SHA-256: 9cce08493f29eb11945938a3609c8bd829ae038b127c332df8664fa589c1e8c1
font_01_sfnt_off00009bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BD7 11372 bytes
SHA-256: 7683437fcd330f0de1e74e739ba6193953f825e3ad42612c45938c842e5a4849

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