Malicious PDF — malware analysis report

Static analysis result for SHA-256 9920df550559f062…

MALICIOUS

PDF

65.8 KB Created: 2020-09-30 04:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c491afe7dbcd74e50a3661f1aadd3c63 SHA-1: 7a9a2b191477139eae9dc8b78ee576670280452f SHA-256: 9920df550559f062e0aeeabb8b2f0a2b2dbc64b4b2c1d7c56e9877002fb44e38
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract traffic. This suggests the primary goal is to redirect users to malicious sites, likely for further exploitation or phishing.

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://gettraff.ru/strik?keyword=category+theory+pdf In PDF document text
    • http://files.vipatacticaltraining.com/uploads/1/3/1/8/131856247/kabesimuni.pdfIn PDF document text
    • http://dukewajo.shannonsstudio.com/uploads/1/3/2/6/132683292/9128695.pdfIn PDF document text
    • http://kakigo.hangyourquilts.com/uploads/1/3/1/3/131384613/33ab83db.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/d570a2b4-f336-483e-b0fe-eb8fec510745/liruwenakomijegafuluso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93f642e8-fcf3-4cbb-81b1-b9ae2509bfa8/59939514468.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14866fd3-1275-49ee-92b0-1a0b7e6a1721/logabujofozuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85192821-cb34-4c6f-9084-da0eff051763/pojomesazebujux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5f0f9f0-1a73-4cd0-87f9-46baa381cae4/xatosixumujebijejer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65be0921-3862-417b-9bfb-9f6727dbff6d/xikugorusopiwuvoralonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e8d0bfe-9f1a-4126-a7a6-0edbddffc730/29182246411.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e38ed4a5-bf09-4fd8-b122-da5e4414ac1a/85612833333.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2143/2992/files/95178245362.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5829/1093/files/tumolilodelisanubebifolek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8674/9604/files/99822249046.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF56 5100 bytes
SHA-256: b745782656557fb2b09f076eb29f4bd832e5207d42a42d7c6ea4a5ab10aed02e
font_01_sfnt_off0000c0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B2 10608 bytes
SHA-256: 1eaa3348b1ef19803f5c9506b4e1c8756d6b10d75da0bc8ab17a77c6a61a360e
font_02_sfnt_off0000e4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D6 16152 bytes
SHA-256: 9dd161ad083bde31f1785977080a21cd00ffd1d65af7312c0685ba069ea0c2ef

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