Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b601b734c4bd299…

MALICIOUS

PDF

71.4 KB Created: 2020-10-16 05:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 03021124f35caddf1fddb2447cbe4218 SHA-1: 7654c6c0e7d5424e7fdb2a6b53b60ff5cd8d36c6 SHA-256: 3b601b734c4bd299a577c5ae428fbe33643a943a50a5a5264a14beb08ab18cef
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of a known malicious redirector URL further supports this. While no scripts were extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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/123?keyword=asus+strix+gtx+970+overclock+guide In PDF document text
    • https://zavigajigufuf.weebly.com/uploads/1/3/1/6/131637719/jizitotevaw.pdfIn PDF document text
    • https://zuxuzesis.weebly.com/uploads/1/3/1/4/131438019/ravovewilikidixit.pdfIn PDF document text
    • https://ritibamubube.weebly.com/uploads/1/3/1/4/131437410/2508234.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371497/normal_5f88525b4fa52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369313/normal_5f88dff3c4fc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374021/normal_5f88c2587b58f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370285/normal_5f88d32699119.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373522/normal_5f8903c5c4a25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366664/normal_5f87bc34bc74c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366047/normal_5f88a08f01d2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f8715e591ecb.pdfIn PDF document text
    • https://site-1036713.mozfiles.com/files/1036713/3183704876.pdfIn PDF document text
    • https://site-1041405.mozfiles.com/files/1041405/70591224115.pdfIn PDF document text
    • https://site-1039398.mozfiles.com/files/1039398/pifexesiwonopugesunor.pdfIn PDF document text
    • https://site-1037268.mozfiles.com/files/1037268/xonojonaxe.pdfIn PDF document text
    • https://site-1040876.mozfiles.com/files/1040876/candy_crush_mod_apk_uptodown.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/fe47390c-2149-40d6-a609-c1107b49fb9c/simunozotodog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1031a5b5-8ac6-47dd-b7f8-7986d7f5bac7/84737998874.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90ed6b9e-5a3a-4c68-b991-7c98687d52d6/47701184871.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6630/2359/files/the_legislative_branch_congress_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/7374/4295/files/vozopinigubarajulo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/1296/3482/files/78260090064.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3680/5782/files/43798077533.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/1769/5142/files/dr_schulze_bowel_detox_instructions.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_off0000cb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB71 5456 bytes
SHA-256: 9ad474e5afe904a23568e9d4fd7f807c6c5587e582d069fe75f125bb41b7bd70
font_01_sfnt_off0000de19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE19 15920 bytes
SHA-256: 11e57d6b1f5fb6309e7d8580413a9becb9577c820d2a292b3647a4789f84f133