Malicious PDF — malware analysis report

Static analysis result for SHA-256 035886d22a8faa50…

MALICIOUS

PDF

45.0 KB Created: 2020-10-15 08:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cd86a27deeecf6a3aae7ce49f5a04818 SHA-1: d9f3e681e5d19bcc48e3d17a703f5c8bdd5f1233 SHA-256: 035886d22a8faa505c627b104c5d9c903d7ad2a53356de7464bc57d65edd1625
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links pointing to external PDF files hosted on various disposable domains, identified as a link farm. One of the embedded URLs, 'https://gettraff.ru/pify?keyword=robert+gagne+principles+of+instructional+design', is flagged as a malicious redirector. This suggests the document's primary purpose is to direct users to potentially malicious or SEO-manipulated content.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/pify?keyword=robert+gagne+principles+of+instructional+design In PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/7d3707d5d.pdfIn PDF document text
    • https://gidixelasulam.weebly.com/uploads/1/3/0/7/130739099/023710b61d.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/ruripupelikad.pdfIn PDF document text
    • https://melegejisud.weebly.com/uploads/1/3/1/3/131379421/7087037.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/nimemoroligamaj-tafixidupara.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5f874a288ff0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5f87c679f0915.pdfIn PDF document text
    • https://site-1048559.mozfiles.com/files/1048559/65397764250.pdfIn PDF document text
    • https://site-1037860.mozfiles.com/files/1037860/zawozeretiluditekunevife.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/9b53ec72f.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/tekisaju.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/5473886.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/2120396.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/0b21e7b9-7e1c-42d3-932c-6748dbf6a78e/gorerikitugefunimagevaba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45fb0622-b790-49f0-87ee-c8fa1e9d6006/kolafolov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bb93971-17b2-4cd8-8a8e-dcfa425c81ee/vupomogonamopudiwikefog.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_off0000721c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x721C 5472 bytes
SHA-256: 92fe27cd7815934c60778e25b7afbdec439410c2e361e2632b980bfd2bb193a2
font_01_sfnt_off000084bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84BD 9880 bytes
SHA-256: ef9c013346964f62564ff50f70bb9b7072edab2287dea712459d7dd7540d9c8b

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