Malicious PDF — malware analysis report

Static analysis result for SHA-256 4750e4e0d7af3d09…

MALICIOUS

PDF

61.2 KB Created: 2020-10-16 23:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3b3148f3605dcb80882d45c0ae2854fb SHA-1: fa47767435847897b1b6c0154e6a3f5c892bbadb SHA-256: 4750e4e0d7af3d09e287566384b93b83e5301543781097babd6a4eba29002416
184 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier and contains a large number of embedded links, many pointing to disposable hosting services. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to lure users to malicious sites, potentially for phishing or malware distribution.

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=como+elaborar+uma+disserta%25C3%25A7%25C3%25A3o+de+mestrado+pdf In PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/zexekunimisetidif.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/manofuzawidevu.pdfIn PDF document text
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/3501c.pdfIn PDF document text
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/e4e04ccb83ff3.pdfIn PDF document text
    • https://rezizeme.weebly.com/uploads/1/3/0/7/130775554/tozebifojutejumikiba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_5f8968055c1a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369920/normal_5f880ef357891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366357/normal_5f873b19811cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368759/normal_5f88b6b492f55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f879c746aced.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f8739376e210.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f875bc6588ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369491/normal_5f889eafcb85a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365600/normal_5f8717a27e7f1.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/7e19c86c-a83b-4800-b464-f4a9dc1c1eae/92699706490.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7390b0c4-0a38-427f-a829-b50831dc3b43/45769137784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c8c2232-aabb-47f0-ac12-1bd95460d3e4/lizovek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bc40973-799d-4673-b7c6-57651be5a093/vitojowojelid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6576c0ad-1101-4a06-8f13-847fa16a58aa/37816784864.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7839/5080/files/ellis_county_oklahoma_court_clerk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8532/3168/files/does_hsn_run_a_credit_check.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6055/7974/files/parallel_vectors_gcse_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6377a3b3-8b69-40d8-ae73-ba3f8da45563/15616280330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63bc51a0-1f91-4d22-a942-2a1ccc4799da/78020796715.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec7f6ad4-5b67-40fc-a6c3-246a92e5de64/kikimafiwigisufi.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_off0000abd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABD4 5732 bytes
SHA-256: 9db55208cce24d008baea7deb68cf4f0b619b2d6b1f008257213e6091e1e33b3
font_01_sfnt_off0000be97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE97 13144 bytes
SHA-256: 92b4831eabf720179d9360fc931734f63f59205c7dfa3625f94ce91aed51d268

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