Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f9001a97b2b023…

MALICIOUS

PDF

40.8 KB Created: 2020-09-22 16:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9495a93157a52d0d288e13612d5de560 SHA-1: b9f309547db80ceb26215ecb0c1541cbf04878b2 SHA-256: 20f9001a97b2b0237b2624a874fb808822218a2083711db78c1ed756905d08a8
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and one known malicious redirector. The document body, though heavily obfuscated, contains text related to 'constant rate of change' and the URL 'https://ttraff.ru/wix?keyword=constant+rate+of+change+from+a+table+worksheet', suggesting a lure to trick users into visiting potentially harmful sites. The ML classifier also strongly indicated maliciousness.

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://ttraff.ru/wix?keyword=constant+rate+of+change+from+a+table+worksheet In PDF document text
    • http://teriveran.schoettlerhomeimprovements.com/uploads/1/3/1/6/131637056/likalupa.pdfIn PDF document text
    • http://files.hibajaroudi.com/uploads/1/3/1/1/131164236/mefenegovisaxinimu.pdfIn PDF document text
    • http://files.kencarder.com/uploads/1/3/2/7/132712115/kurolukefilewose.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a6eb298d-62ce-4340-8758-855fc70199c2.filesusr.com/ugd/34e21e_b524b6f9c62e4a2f92d1949b4bb5196f.pdf?index=trueIn PDF document text
    • https://81992b18-1067-44dc-926a-0223cc197e3d.filesusr.com/ugd/0df15e_767ea1e6dff2478eb05ea6909f14dd94.pdf?index=trueIn PDF document text
    • https://6fd3b0ee-43fa-45e6-b029-34fa39f0aec7.filesusr.com/ugd/d2751c_982facf72add4b74abe2cdd29fccf62f.pdf?index=trueIn PDF document text
    • https://9f5d779b-d10f-4c94-94b2-8c5c0320d21d.filesusr.com/ugd/368de4_360e9cfbd6a7452ab6b22e0c91159fa6.pdf?index=trueIn PDF document text
    • https://79c27ae1-854c-4393-8333-b028c874f98d.filesusr.com/ugd/cdb50c_2dd10685b02d40eabf47948e7aa98f95.pdf?index=trueIn PDF document text
    • https://c5f36a3a-385c-4d71-a045-77049a5e9773.filesusr.com/ugd/5a4aad_da8b83d1843545f0b84cdea147bf33b2.pdf?index=trueIn PDF document text
    • https://e36aa1e2-348c-47df-991a-40cb344c9597.filesusr.com/ugd/1da05d_a65f0eecc01241f885d42afcb259d62b.pdf?index=trueIn PDF document text
    • https://f9fd0a0f-61d8-4399-b2e5-dd0c30a8e7a1.filesusr.com/ugd/0a593f_697ece675bc2442db2ba266219385234.pdf?index=trueIn PDF document text
    • https://d69c0b1d-7f25-4714-83de-358db31600fd.filesusr.com/ugd/c3f59f_d54b5e5b895440968045c29ba08c06d7.pdf?index=trueIn PDF document text
    • https://82a059f4-070a-4c72-9f32-57b9ea1119b8.filesusr.com/ugd/7dfe85_9b66f7bacedd40f18ccfd5f4e443d015.pdf?index=trueIn PDF document text
    • https://f84c539a-369d-47b7-be7a-11d7fe6e460a.filesusr.com/ugd/a07927_c193d9e1646146bfb8b290bd76c99b0b.pdf?index=trueIn PDF document text
    • https://32004391-1ff6-45a9-a63c-e10936cc52ed.filesusr.com/ugd/81cd61_8f99fca21c104d87b9dcaf46434753b4.pdf?index=trueIn PDF document text
    • https://3f6e5fe0-7d8d-4d83-a016-cbd7db5b381d.filesusr.com/ugd/771ea4_207d7641c14d4d55b2200d01b648239e.pdf?index=trueIn PDF document text
    • https://15877296-e0ce-4d14-bff1-09e37721fd3e.filesusr.com/ugd/ca32a8_531dee7aed3d4546bd07d25243ca8cb5.pdf?index=trueIn 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_off00006115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6115 5496 bytes
SHA-256: 00a28cb2abd3e3d4e7676e5c4fd8be2011abc5dc712158427153421a833a2b08
font_01_sfnt_off000073ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73AE 10028 bytes
SHA-256: b752fcc43acef4d59a450430f8b973f2a7f5a0af544ee383875a7e5ac992fc93

Open this report in the interactive analyzer, or submit your own file for analysis.