Malicious PDF — malware analysis report

Static analysis result for SHA-256 d256b656754a5d42…

MALICIOUS

PDF

42.0 KB Created: 2020-10-28 04:32:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3939e1a386235e0910abd9a9329c4163 SHA-1: 4769303cdfee64dc015f78318fa704b48c4a7950 SHA-256: d256b656754a5d4206e46f9ce7b5734abb068330b33681d993c72621fba93d47
162 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ggtraff.ru/wb?keyword=gs%20combine%20pdf%20linux, is identified as a malicious redirector. The presence of a "download button" heuristic further suggests a lure to trick users into clicking the malicious link. The ML classifier strongly flagged this PDF as malicious.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=gs%20combine%20pdf%20linux In PDF document text
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/tanejagife-zogozobogix-dazedareraxugem.pdfIn PDF document text
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/wedasutoxa_sigit_tonexexu.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/1/0502/1397/8291/files/jixitevoxoriguj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/3283/6768/files/sitemalad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0147/0366/files/76503741367.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7087/4284/files/grain_boundary_engineering.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2044/3045/files/fapifovusanaxawosapuwa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0351/0421/files/knorr_pasta_sides_parmesan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6387/7537/files/24827059187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/343720de-b473-4d10-afe4-f8e69e7309d7/82602040687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ff7b1de-d636-4182-a403-d6e7c79ea228/58873688843.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/common_interview_questions_and_answers_for_electrical_engineers.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/caballo_de_troya_9_descarga_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/doterra_essential_oil_uses.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/una_profesion_peligrosa_luciano_canfora.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/95389164054.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eb843d5-d8ea-4225-b72a-cd4c5847b729/suxagitata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79f27a21-3b2a-4ba3-9d01-a102420387c4/xizukisadidese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd728058-effe-4865-8e5c-2f16433b3926/26454904651.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73b01f4c-4bf9-47cd-9be7-2c3efd214743/38922954280.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_off000063cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63CD 5232 bytes
SHA-256: 5be4d7637096c67e568748d48436bcd47f363a2fb3062a533ed34d138e1ffaaa
font_01_sfnt_off00007592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7592 10960 bytes
SHA-256: 806bb1be3e90199c4e08be5af953096e8fce7483a6ec64c4002ac5263081648d

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