Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08279f3d1204007…

MALICIOUS

PDF

34.3 KB Created: 2020-07-08 16:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: bd610b528d16f0aa80af8649217d86ad SHA-1: 3a64236d634ca316f1ebae4d85ebf49ac3719215 SHA-256: d08279f3d1204007fafd184b55045d81fbd6698fbfae14df6ca0868b330ed087
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell T1204.001 Malicious Link

This PDF file was flagged as malicious by an ML classifier and contains numerous embedded URLs. Several heuristics indicate it functions as a link farm, with many URLs pointing to SEO-optimized PDF files hosted on various domains. One prominent URL, https://ttraff.ru/wb?keyword=capital%20letter%20worksheets, appears to be a redirector to malicious infrastructure. The document body, though containing garbled text, also includes many of these suspicious URLs, reinforcing the link farm and redirection attack pattern.

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://ttraff.ru/wb?keyword=capital%20letter%20worksheets In PDF document text
    • http://files.majujayamachinery.com/uploads/1/3/1/4/131438150/rofenuxabitamoniso.pdfIn PDF document text
    • http://files.cdkassotis.com/uploads/1/3/1/6/131606550/1235330.pdfIn PDF document text
    • http://files.lockmangenetics.com/uploads/1/3/0/7/130775383/nizejab.pdfIn PDF document text
    • http://files.firstathens.org/uploads/1/3/2/7/132710687/9347935.pdfIn PDF document text
    • http://files.ekizna.com/uploads/1/3/1/3/131384599/fedikoke.pdfIn PDF document text
    • http://files.istitutomondoitaliano.org/uploads/1/3/1/0/131070379/2427500.pdfIn PDF document text
    • http://files.johngetsmariad.com/uploads/1/3/0/9/130969503/sutav_waxixuravuraluw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://goxafizazo.files.wordpress.com/2020/07/roxitobunodepugikumoxotek.pdfIn PDF document text
    • https://lunulaxoxo.files.wordpress.com/2020/06/33146508343.pdfIn PDF document text
    • https://kafafawabeso511102548.files.wordpress.com/2020/06/43249485181.pdfIn PDF document text
    • https://pezezej.files.wordpress.com/2020/06/kodujatagupamawigenij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69262577592.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66916333827.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pizegavegip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/doxufuvezemog.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C58 4768 bytes
SHA-256: 4666145d1a21a7c8caf68cbdac5764a0bcdcecb3dec7dcc6143a9e39991c17fd
font_01_sfnt_off00005cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CAE 9456 bytes
SHA-256: e64369fb31e0176fb34117c94f4ae16288a9ef71838f8f87fa959741c50447c4

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