Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae96a71da42bcd33…

MALICIOUS

PDF

46.2 KB Created: 2020-11-03 00:07:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1c9d265053a6aede3fb819dbe9f3ece6 SHA-1: 33cacac072930206375623eb8e2f72b6d221b566 SHA-256: ae96a71da42bcd33de57ad3433a6fa62cc7a55f924aae211c5797992ed013bc8
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of embedded links pointing to various PDF files, identified as a link farm. One of these links, 'https://gettraff.ru/strik?keyword=us+map+labeled+with+rivers', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and a URL, suggesting an attempt to disguise the malicious intent.

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=us+map+labeled+with+rivers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4414156/normal_5f99dbcb8d2cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408004/normal_5fa082faf201c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382618/normal_5f8c16ce4140e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/6e22252d-b1f4-4538-b76c-1cc1c9d0d080/rubizekugiloduv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3892/3672/files/effective_public_relations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c2f8e72-28b3-477c-b685-9f60ce5cc505/towekekikolaliv.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/95600443674.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/0268/0263/files/zudazuje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a513102-d320-484d-9a42-1b9b7571aed7/movav.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/artificial_intelligence_in_hospitals_and_medicine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d595ffc-4fe9-4f30-bca8-d1785a1e0b9e/the_longman_reader_10th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39ec7132-46a1-4fff-a127-c18b34dddb6b/93877836298.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7868de24-4930-417a-9595-f796cad977bf/referentiel_conducteur_de_ligne_sncf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67AB 5052 bytes
SHA-256: 50c35134c4b4a59e9e63aaa98e19095d2c11ef67a3db6ad90309e262e6afcddb
font_01_sfnt_off000078df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78DF 10928 bytes
SHA-256: 0486071726d68a353305f3e744019cc6f91c6af391537e216e01dea33c3b0d22
font_02_sfnt_off00009d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D95 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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