Malicious PDF — malware analysis report

Static analysis result for SHA-256 73252a5981c96614…

MALICIOUS

PDF

48.6 KB Created: 2020-10-14 22:40:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 113ef0621497c3a0e4ecee2071e0f08d SHA-1: e0e804d946c236dbf54b934a1063287e69375d0f SHA-256: 73252a5981c9661458ed475e1f3944a889e8c11aa22ffe714723fbcc9e3f5aa3
184 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 known malicious redirectors or disposable link farms. The ML classifier also strongly indicated maliciousness. The primary attack pattern observed is the use of a link farm to direct users to potentially harmful websites, possibly for SEO manipulation or to host phishing content.

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=digraphs+first+grade+worksheets In PDF document text
    • https://site-1043404.mozfiles.com/files/1043404/tuwulekagida.pdfIn PDF document text
    • https://site-1038952.mozfiles.com/files/1038952/75903248914.pdfIn PDF document text
    • https://site-1039772.mozfiles.com/files/1039772/20362228000.pdfIn PDF document text
    • https://site-1042821.mozfiles.com/files/1042821/69726679070.pdfIn PDF document text
    • https://site-1036835.mozfiles.com/files/1036835/86313161463.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/mezevoxinokimuwamibu.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/6263159.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/3809296.pdfIn PDF document text
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/3905791.pdfIn PDF document text
    • https://zuwumepegowivos.weebly.com/uploads/1/3/1/0/131069935/2642225.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/85f5a0.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/suvex-xebubonozov-gavubukegago.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/xizaxamuxive.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/rebodi.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/8554420.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/a2bc8041-c6b8-4d6a-80d7-a509095624aa/lasabidogijetadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c00c5e62-67d3-4d78-804e-42a1f71a8247/zibiratobedudu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fffc0868-6711-42ba-b741-ae0a65c44a55/zuvukekus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17c21530-9bc3-4deb-a09a-551331608b82/manaxuga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4114164-5c2b-41e4-95ea-fa8c203a691c/wikagijopebubawere.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2687/3509/files/los_angeles_sanitation_department_bulky_item_pickup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6653/0728/files/98155295272.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3727/6825/files/unit_2_test_genetics_answer_key.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_off00007efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EFE 5428 bytes
SHA-256: 984ad80d3373aef5560585239f755993c00795c30d97ee9c581b26dd340c24e9
font_01_sfnt_off00009186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9186 10360 bytes
SHA-256: 37f3afe5c9522529609b135d4d01a96a7943f7cf02d386ba51d5f7ee563a2df5