Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff3827bda933843…

MALICIOUS

PDF

48.0 KB Created: 2020-10-16 08:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 43ce90ab2c1fae7a8ec87d8706b273ae SHA-1: 72bd358d8a0cd77394bb60f4d3e885acdeb81eed SHA-256: 4ff3827bda9338432be6af42f9fc1bad14d116d627f3c3b80d19830390219b82
154 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically 'https://ggtraff.ru/123?keyword=analog+electronic+circuit+design+pdf'. Additionally, it hosts a large number of external PDF links, many of which point to striking.ly, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness.

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://ggtraff.ru/123?keyword=analog+electronic+circuit+design+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373992/normal_5f8934ac79405.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f8716a74a400.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370985/normal_5f8866680fcc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365601/normal_5f872e4dce418.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5f873f6d01e4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368224/normal_5f88790fb5154.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5f86ff84e90cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367947/normal_5f88bedcefcc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369304/normal_5f889cae083d1.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/3e09f44c-6a64-48bc-af23-c6054fd3dca7/zuwikubivenekopezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/906e0d5b-f975-4f89-a3d8-f1c370ca5731/82342471421.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/983e0e9f-bac5-4896-8043-1c20f75a5183/lasufolalirikozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3d3b9d5-ad8d-43a0-8c97-f4b7efe472dc/duzuxegovejobevanozit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0467/7494/3897/files/rebid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/4439/5930/files/3502277880.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8307/9584/files/imac_a1224_repair.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/8763/6896/files/lutubelirebupuximuwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea1447de-6d10-467f-add6-5ca712d6c234/fubadupapategegokuloma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d821452f-cc07-4a20-8ebd-64a6a853efe5/mumisowivudozitabakimeza.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_off00007d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D9F 5312 bytes
SHA-256: ec04c9c6be11aef15f2571db3ebeb179dc844f627b25339e17b686d5a776733c
font_01_sfnt_off00008fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FBC 10232 bytes
SHA-256: 2f8040f6217209d57071c3ce3e619ca9afd3a3a8d8216ebad695e5408974756c

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