Malicious PDF — malware analysis report

Static analysis result for SHA-256 c566b872ace5ac18…

MALICIOUS

PDF

37.8 KB Created: 2020-10-22 11:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: cc1f102262776c6c48838891b0f33d4b SHA-1: 970366f02747847423fb15262fa7322a3db15134 SHA-256: c566b872ace5ac18881fdae5f327b8d3a7cac1fcd3675cfadd12518889af8625
184 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 disposable hosting services and redirectors, indicating a link farm designed to distribute traffic to potentially malicious sites. The ML classifier strongly flagged this PDF as malicious, and the presence of redirector links further supports this assessment. No scripts were extracted, but the primary attack pattern is the distribution of malicious links.

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://ggtraff.ru/123?keyword=direito+penal+bitencourt+parte+geral+pdf In PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/fibawubaxavuvabu.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/7061675.pdfIn PDF document text
    • https://fuvipizewovotat.weebly.com/uploads/1/3/1/0/131069886/libetit_werolubadawipu.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/lukinabowib-zazepuwilef.pdfIn PDF document text
    • https://rabexowubomisuw.weebly.com/uploads/1/3/1/4/131407155/niluni_givutar_xazorewedewefu_dogotomedadej.pdfIn PDF document text
    • https://kupugaxome.weebly.com/uploads/1/3/0/9/130969415/gekofelosovimekagaro.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/piruxubowizogoxex.pdfIn PDF document text
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/xomorole.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/ac951c3d-6778-4b53-b7c7-a853cfafd313/53891374345.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f258247-83f7-405e-a2c6-de6a4aaafb09/gawavuzuvizol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ebaddbf-b5d4-4527-b076-1f445d4d061c/budedokitobifivul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aabb8038-d15c-4459-b24f-e4eaf3664e8d/jorananeda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8de4f7e-4d40-4155-909c-098ca11f7e5c/reality_fighters_trophy_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7928345f-7727-47c9-8edc-aca2fa97c0eb/gegavo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15e8f316-4c50-441c-a690-07a9ed805273/56645566206.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/933a8a2a-14ed-479a-8167-fa1005f7f414/27516673894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a28dbbd-eae2-487f-9b1e-55f33c0cdb74/xunubemipolifi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/4650/0030/files/mario_kart_64_android_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7513/4135/files/download_apk_vidmate_for_laptop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3925/0853/files/bobson_air_freshener_dispenser_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/3943/9032/files/kepuditusazirul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5926/0821/files/recetas_con_camarones_cocidos.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_off00005339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5339 5284 bytes
SHA-256: 9103980e8f3720b10577566871a033c5218549dcab8f079cb19a4ebe79062855
font_01_sfnt_off00006536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6536 11664 bytes
SHA-256: 9a4100ca2f644c711cf64d09c31cdba5707832b3fa0f116bf507ea368b09bc72