Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7fec6afb1f307c…

MALICIOUS

PDF

63.6 KB Created: 2020-10-15 12:41:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 93e3e1fda18b53011008076ccb5db5b7 SHA-1: e90acbcefcb0d436462e1e7090965689c0d9e459 SHA-256: da7fec6afb1f307c031ebe23e7c8202ec62937ebe0a7325ec1453423b5ae948f
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically 'ggtraff.ru'. The document body, though heavily obfuscated, contains a URL that matches the heuristic finding. 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 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://ggtraff.ru/strik?keyword=formulation+of+optimal+control+problem+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_5f878547317cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366344/normal_5f879a53ac8bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369153/normal_5f87d394e6519.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_5f87043b3dd4b.pdfIn PDF document text
    • https://site-1038837.mozfiles.com/files/1038837/jabijuvitufuk.pdfIn PDF document text
    • https://site-1041773.mozfiles.com/files/1041773/factorization_worksheet_for_grade_8.pdfIn PDF document text
    • https://site-1037196.mozfiles.com/files/1037196/tujedupil.pdfIn PDF document text
    • https://site-1039672.mozfiles.com/files/1039672/pavedikefuwureb.pdfIn PDF document text
    • https://site-1038343.mozfiles.com/files/1038343/paganakudazajexo.pdfIn PDF document text
    • https://site-1043537.mozfiles.com/files/1043537/69722286721.pdfIn PDF document text
    • https://site-1040427.mozfiles.com/files/1040427/36309456777.pdfIn PDF document text
    • https://site-1048184.mozfiles.com/files/1048184/bedezolitaraki.pdfIn PDF document text
    • https://site-1036644.mozfiles.com/files/1036644/6098896947.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/df71409f-b4ea-4c24-85e0-fba091077d5e/50972670232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bb7caee-9b9a-43fe-9078-baa0904534d9/4354550589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f47f5ce-15fc-4812-85f7-dd5b454adcf7/xaxumimobukoxuzek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b752dec6-ef59-44a6-8701-a9054fddf104/47363994105.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_off0000a008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA008 5100 bytes
SHA-256: 74263dc914b205b8d2bac347ec174c854e4c3b34e585a5a46e2bbd0e68220ceb
font_01_sfnt_off0000b138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB138 16012 bytes
SHA-256: 611c78823c2ce433c58f294fc44800248a2d7d54d2a69c3d26f1fcfa56707b02
font_02_sfnt_off0000e2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EE 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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