Malicious PDF — malware analysis report

Static analysis result for SHA-256 61794b0aa98b0bc0…

MALICIOUS

PDF

41.0 KB Created: 2020-10-17 13:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6628d2b1a48b166ce194115c47589574 SHA-1: f05fcb54084067b5be24dfa3a10742d9484f39a0 SHA-256: 61794b0aa98b0bc00b2916f68ac34c36d3635859bd58a8577ca1806ca077f78a
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting a lure for 'Othello sparknotes pdf download' and includes the malicious URL. The ML classifier also strongly flagged this PDF as malicious.

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://ggtraff.ru/123?keyword=othello+sparknotes+pdf+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369765/normal_5f8a8a19cbda6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375356/normal_5f8a47ab0c5a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366327/normal_5f873d8b4ab7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f86f8b762a36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366664/normal_5f872dcd23b80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367289/normal_5f873bd659bdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5f871a832b0c5.pdfIn PDF document text
    • https://jezaxegare.weebly.com/uploads/1/3/1/3/131380636/305207.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/velimi.pdfIn PDF document text
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/3966742.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/0c18874847f.pdfIn PDF document text
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/vawokonufelo.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/d5ea73d6-bd42-4e8f-888b-28d0d41d2546/tosuxovopukonikabafogixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13ee783b-94a7-49d7-b0cf-f26e1fa24166/11098629427.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a5c4da0-2862-43ce-b298-5714171c8a02/94087792837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8cd854e-120f-40c1-8931-970e718793f9/dodalotewuxejuxopum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/913d9ebb-2afe-4740-aefe-93c229cc7e8f/dragon_ball_super_episode_111_englis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/878116b5-f82d-4eae-8508-0798f15175a5/44651245651.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/778a9157-a9a2-429d-8921-22c8642b4dd3/66485147817.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c11c265f-cebb-4742-8473-a198022b86c5/15566476314.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_off0000628e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x628E 5312 bytes
SHA-256: 6eb806e1acb90498048a2561fe42b7a6158db1b031998ef4a53b1c605138cdba
font_01_sfnt_off000074a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74A5 10028 bytes
SHA-256: 1a09e890f010a762ecfa66b38d954a08a6bce8e8beab51ef8c1099118996c0fd

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