Malicious PDF — malware analysis report

Static analysis result for SHA-256 774b93c87dbc75f4…

MALICIOUS

PDF

51.4 KB Created: 2020-10-28 06:11:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: aaa58abc08ed5b847dd5d455f64dffe7 SHA-1: 98f5efd08d204dc4d7472bc2e3380f4d44dfd5d0 SHA-256: 774b93c87dbc75f48550384cf17f2c59121d8378a2005e0846eaed088c4d37ed
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with several identified as pointing to known malicious redirector infrastructure or link farms. The ML classifier strongly indicated maliciousness, and the presence of these links suggests an attempt to direct users to harmful content, likely for phishing or malware distribution. No scripts were extracted, and the document body was heavily obfuscated.

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/strik?keyword=eb+ice+machine In PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/tixobenudofezibet.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/gexenop.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/suwixerireleb.pdfIn PDF document text
    • https://bakigimos.weebly.com/uploads/1/3/4/3/134322269/3054969.pdfIn PDF document text
    • https://tiposowa.weebly.com/uploads/1/3/1/1/131164246/e28c5d48f3ca4.pdfIn PDF document text
    • https://rawebitor.weebly.com/uploads/1/3/4/3/134337567/pogudefajugi.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/5adf50a6af11.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://cdn.shopify.com/s/files/1/0486/1460/4958/files/ysinx_in_terms_of_x.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7660/8685/files/70760383063.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6561/2720/files/panorama_del_derecho_romano_editorial_porrua.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/2064/6048/files/38555811607.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/4465/1167/files/centerpoint_sniper_370_crossbow_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/47033531011.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/begone_satan.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/bernard_lewis_indir.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/demographic_characteristics_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/pre_algebra_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/action_research_project_for_b._ed_students_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/bookish_boyfriends_book_2.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/rerapigoredojelisexi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4155/7160/files/butemedisakebux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/1489/3980/files/mulomoviritu.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_off00008038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8038 4428 bytes
SHA-256: 3795e2139d8970736e7f6ceb6d8ede20044cc9232564a9527d2a6dc173529419
font_01_sfnt_off00008f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F07 10384 bytes
SHA-256: 06dfb135c10f080f466231037d34ae815df22d3d738db4aa0b6b74553fdbd218
font_02_sfnt_off0000b22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22A 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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