Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6847cf052ed1a79…

MALICIOUS

PDF

42.9 KB Created: 2020-10-19 07:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: a4a8d4bfe6a2ed51e33e7aa0a573e607 SHA-1: 41a9e065c3be278ab9aa1b414f6f3be7cc89fb75 SHA-256: d6847cf052ed1a79e569e97f442f06a02bc6229ab3787559eac15f5a3638aabc
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier and contains numerous external links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains a URL that points to a potentially malicious redirector and several benign-looking PDF files hosted on cloud storage. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content.

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=android+tv+box+gi%25C3%25A1+r%25E1%25BA%25BB+%25C4%2591%25C3%25A0+n%25E1%25BA%25B5ng In PDF document text
    • https://wesujugureju.weebly.com/uploads/1/3/0/8/130874517/bapamap.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/metor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368999/normal_5f8abd7dbbd85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370280/normal_5f882f2154b3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379236/normal_5f8a4dc8dee50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369158/normal_5f8997f4c7d1e.pdfIn PDF document text
    • https://botubadixebom.weebly.com/uploads/1/3/1/4/131407995/givukitikexolili.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/7089992.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/b22b7e97.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/4ed29edd-1d9e-4b40-903d-45bc8902a7c4/sobitusuwomezimef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5c1bac3-3bec-4c83-bb7e-c12f4a7a38b6/73029078604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba401a72-7e97-4d8c-bf2e-36b0a09dc5e7/koluwujutudafoludepokevum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/612469f8-cfcc-476c-871d-36176f8651a7/48627953671.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/8979/6513/files/38411412192.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9944/6166/files/dararopajumutitutuwa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5679/8117/files/sample_scholarship_application_letter_for_masters_degree.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7669/7246/files/39465121091.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8258/9357/files/47540812384.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/7481/8726/files/sogejinosoxotokega.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_off00006544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6544 6008 bytes
SHA-256: a37d87754d927f9bb9081400bbd2b25ee8181f830a4eb72284cb7ea847bdeeff
font_01_sfnt_off00007834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7834 10604 bytes
SHA-256: e48f8cc685b839c6f13c69255792676d8beae895fe642875dd7dc591108a57b0

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