Malicious PDF — malware analysis report

Static analysis result for SHA-256 88fb37eb09f159f2…

MALICIOUS

PDF

67.1 KB Created: 2020-11-07 07:13:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 12bf18a762bf32ba2adaebe1366f3cb9 SHA-1: 97306c51b68e61922e677fd1f611f472d5888264 SHA-256: 88fb37eb09f159f20a5b977bedfae94eff50d5192f8cd49026abdbc4042dfd7f
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with one identified as a malicious redirector. The presence of a large link farm suggests an attempt to manipulate search engine rankings. While no scripts were extracted, the ML classifier and the malicious redirector link strongly indicate malicious intent, likely related to phishing or malware distribution.

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/aws?keyword=pocono+woodland+lakes+pa In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376369/normal_5f8c254764b44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_5f8778dee329f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367617/normal_5f9462f5da5da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403118/normal_5f918730c0051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366984/normal_5f87b80818d4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368746/normal_5f8f62889ce61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402247/normal_5fa197df53209.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_5f87849989643.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fezenur/lion_den_leader_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8800c2f-15a0-4d00-b7ea-4a55be4c5e1e/gisivuvoban.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/nissan_quest_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da770cdd-ebf4-4ca9-a7a6-8768286db219/lewubefiwofonuweg.pdfIn PDF document text
    • https://sufuvuse.files.wordpress.com/2020/11/3074016501.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_off0000c7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B4 5128 bytes
SHA-256: 2e2d9cdfc4b5069635b8b318ebaccdbac575b6b8325eb2ecb21d67ebe481d42d
font_01_sfnt_off0000d953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD953 11492 bytes
SHA-256: 378084324cea55ff3176a32275b6402e1a93113499746f19dd138f202ebe460a

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