Malicious PDF — malware analysis report

Static analysis result for SHA-256 a944c96f2a15e403…

MALICIOUS

PDF

47.5 KB Created: 2020-10-26 22:16:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a4d86f67101369e137e9214c0a596cf7 SHA-1: d356d99347befb894fe5e0221f93ba7ae5c2a17c SHA-256: a944c96f2a15e403a85e6dcd96d6f34ec691481609c8fa9fd9e80ec869e41679
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign content, but one critical link directs to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to create a link farm or SEO spam, likely to obscure the malicious redirector. No scripts were extracted, but the presence of the malicious redirector is the primary indicator of compromise.

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://cctraff.ru/strik?keyword=police+story+4+first+strike In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5f87797024e5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376125/normal_5f8eb96820f4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371266/normal_5f8b16f08c60a.pdfIn PDF document text
    • https://sizukejagu.weebly.com/uploads/1/3/2/6/132681884/95a3305.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/xokomaduwazag.pdfIn PDF document text
    • https://bakuwosir.weebly.com/uploads/1/3/0/8/130874569/6092007.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/kazupogo.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/zaburadi.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/the_origin_of_continents_and_oceans.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/mezokutugijuzawew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/5533/5574/files/ley_contra_el_odio_venezuela.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2944/1954/files/95775024400.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2815/1959/files/44468971371.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7528/0306/files/telnet_android_port_forwarding.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6138/5648/files/my_talking_angela_apk_hack_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0064/2721/files/11868489202.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4768/0162/files/zajamawebat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4916/2654/files/aroma_rice_cooker_instructions_4_cup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7355/8935/files/la_tahzan_book_free_download_urdu.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/15637436517.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/indian_railway_station_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/xawopilubetomiwumames.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/bitzer_screw_compressor_troubleshooting.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_off00007c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C25 4920 bytes
SHA-256: cdde3c71dd75211c35f6af9ff88dc67cc0f0fe0ff17673c1858fa3a0775247d4
font_01_sfnt_off00008d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D01 10532 bytes
SHA-256: 95bcf1f5e480f83616bf4e5596f74286539e0e9be8c23c708100b19394b84c3d

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