Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d6e8a29530ac2f…

MALICIOUS

PDF

37.7 KB Created: 2020-10-14 21:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ff249a20e658daf3bcc5666f8e088582 SHA-1: 5a4ebe3fe66b17b39bf0b1dd74812b93126e89f9 SHA-256: e8d6e8a29530ac2ff798cd664df412396cb0e707b29228b5402a896a3de659b2
154 Risk Score

Malware Insights

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

The PDF document contains a lure related to 'wsava vaccine guidelines 2020' and embeds a link that redirects to known malicious infrastructure. The ML classifier strongly indicates maliciousness, and the presence of numerous external PDF links suggests a link farm used for SEO poisoning or distributing malicious content. No scripts were extracted, but the primary attack vector appears to be a phishing lure leading to a malicious redirector.

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/pify?keyword=wsava+vaccine+guidelines+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366628/normal_5f871e7be406f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366377/normal_5f873ca0a2010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5f872ea6024af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5f870e4785a38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5f8745e4b91a7.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/1441493.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/rugatu-rugot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0263/2104/files/1702411611.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/4853/3655/files/13065794597.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0652/5079/files/sewuvetitekalipeti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/7915/8948/files/jirokedoworazoxorelu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6648/5655/files/lulofebaxibikuvan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad9cc855-2ff1-4ff5-a3cf-67035aa03e72/vegetafezoret.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9d7495f-1164-45a9-b965-20857c764c11/bowobamodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9adf5e56-d300-4f6f-8efd-9ece6bf50204/63400166484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eef55f3f-c11d-426c-89bc-be0d7009eb21/70257881702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3789d40b-7c81-4d5d-b10f-699c9b5633a2/xamuzezovoduliwupovaxajas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7622/3129/files/23359961617.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6113/2968/files/mojulodifovojuseredofi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3705/5393/files/fnaf_sister_location_apk_android_1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/8970/2301/files/68498368108.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3069/1496/files/bizexojunuvo.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_off0000550b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x550B 5356 bytes
SHA-256: c07d211cbeb5400ece723debe958d6389109660eae3d7be5383d85ba78b1ef3c
font_01_sfnt_off0000675d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x675D 9916 bytes
SHA-256: d39b936e0295ec84a4d591c383c838a6604b8dddf6c7f6faa74bedb0bbe33a13

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