Malicious PDF — malware analysis report

Static analysis result for SHA-256 52611f2d90ac036e…

MALICIOUS

PDF

37.9 KB Created: 2020-10-15 22:39:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 05e575f7f3c8acafad7d294a8074f00e SHA-1: 56fd162ca1743a53d5de7a309c92aa9fa1f892f6 SHA-256: 52611f2d90ac036e0a3c6f81025624a6d1a620e1a854a3767123c64739e21f1c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous embedded URLs that point to other PDF documents hosted on various domains. One of these URLs, 'https://ggtraff.ru/123?keyword=target+wall+shelf+instructions', is identified as a malicious redirector. The document's structure and the presence of a malicious redirector suggest an attempt to lure users to malicious content, likely for phishing or malware distribution.

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=target+wall+shelf+instructions In PDF document text
    • https://site-1037079.mozfiles.com/files/1037079/75095590231.pdfIn PDF document text
    • https://site-1039489.mozfiles.com/files/1039489/wadatek.pdfIn PDF document text
    • https://site-1043704.mozfiles.com/files/1043704/dobofizegagevi.pdfIn PDF document text
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/sivadibomanaxewo.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/zakeme.pdfIn PDF document text
    • https://sujajikozodes.weebly.com/uploads/1/3/1/3/131384638/kavajumu.pdfIn PDF document text
    • https://ruwopevod.weebly.com/uploads/1/3/1/3/131397973/3918842.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/42123fe9c.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/3794757.pdfIn PDF document text
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/mujijarawenuwinosif.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/9489200.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/f5d445.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/bupemigimamuvap.pdfIn PDF document text
    • https://jaserasozupog.weebly.com/uploads/1/3/1/4/131454215/sodotipa.pdfIn PDF document text
    • https://povutepumik.weebly.com/uploads/1/3/2/7/132741486/lebugodoj_xufadijemorov_davubesezon_koravisawonub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5028/2393/files/majasagujabi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/7486/6337/files/6014375351.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2915/8295/files/microsoft_security_essentials_manual_update.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8810/1030/files/endocarditis_idsa_guidelines_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0046/1474/files/96829921639.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/4865/5806/files/limij.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_off0000588b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x588B 5184 bytes
SHA-256: cc20f3c626171d5f59f78bdd9de6457e2024f7f09ca90754b9c9fe23232ee533
font_01_sfnt_off00006a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A36 9456 bytes
SHA-256: d4f43296fb47be4ceadeb5c1d5d736945105e06dbce39fb26bbf5379ca0f8d56