Malicious PDF — malware analysis report

Static analysis result for SHA-256 b399539d1f615ced…

MALICIOUS

PDF

38.8 KB Created: 2020-07-08 21:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d7692d1592414282fb5bca88d54e7f32 SHA-1: 4bcf26f97be7b92aa923ea0a95f1a4541c9d6b49 SHA-256: b399539d1f615cedb7e1cbaaba4e63458a323c29c53279596fe0bc2988ded9b2
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. The document body text and embedded links suggest a lure to convert PDF files to Word, likely to redirect users to malicious sites. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that at least one of the links points to known malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ttraff.ru/wb?keyword=pdf%20to%20word%20online%20large%20file In PDF document text
    • http://files.theworldofmcewan.com/uploads/1/3/0/7/130738814/gibaja_tawix_wododibura_musimetal.pdfIn PDF document text
    • http://files.wrref.ca/uploads/1/3/1/8/131871677/7b0d76.pdfIn PDF document text
    • http://files.aviationsecuritymanagement.com/uploads/1/3/1/1/131163945/305fc0013a1.pdfIn PDF document text
    • http://files.all4pawsdogrescue.com.au/uploads/1/3/1/4/131455883/9425829.pdfIn PDF document text
    • http://files.yetiwaterpolo.com/uploads/1/3/0/7/130740127/3b4ee453c39d.pdfIn PDF document text
    • http://files.savvytravelsisters.com/uploads/1/3/0/7/130739375/nasurugujofuzapoxe.pdfIn PDF document text
    • http://files.cobilconnect.com/uploads/1/3/0/9/130969853/6ea8d66a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://topujotap.files.wordpress.com/2020/06/bezup.pdfIn PDF document text
    • https://fonagera.files.wordpress.com/2020/06/vevusalurubufaga.pdfIn PDF document text
    • https://nofosepeji.files.wordpress.com/2020/06/zujibimonigopiro.pdfIn PDF document text
    • https://gofuvefim.files.wordpress.com/2020/06/movuzopupupifadew.pdfIn PDF document text
    • https://velibejo.files.wordpress.com/2020/06/wotabi.pdfIn PDF document text
    • https://pafibifum.files.wordpress.com/2020/07/68693889077.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/79265304831.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31052941417.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57727452667.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/juzopuzenafososokazulu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27360052690.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lipowu.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_off00005b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B57 4776 bytes
SHA-256: 19a0fb31ab62936e45d5387806056ffd89bafb8c5a1531f439ba28d8de3182b2
font_01_sfnt_off00006ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA3 10164 bytes
SHA-256: 3eb10bd40d5abaf20dc31227c9faf91bdb9b5f10f24fe60f8b7dfcec299fa8b9