Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db14a8cba1e3718…

MALICIOUS

PDF

38.2 KB Created: 2020-10-03 06:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 61664d06c9160207709c0348b173a63a SHA-1: 3ecc3c974d4219ef045dba8620bf4f99b7ed0775 SHA-256: 7db14a8cba1e37183aaf8faf859704ee4d37cec6b6461590d14e6bb364b89475
184 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, forming a link farm. One URL, 'https://cctraff.ru/pify?keyword=atkinson+han+elementary+numerical+analysis', is identified as a malicious redirector. The document body itself is heavily obfuscated but contains references to these URLs, suggesting the primary purpose is to direct users to potentially malicious or SEO-manipulated content. No scripts were extracted, but the structure and embedded URLs strongly indicate a malicious intent to redirect users.

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://cctraff.ru/pify?keyword=atkinson+han+elementary+numerical+analysis In PDF document text
    • http://finemixo.cggbc.com/uploads/1/3/2/6/132682787/4605942.pdfIn PDF document text
    • http://files.duke-consult.com/uploads/1/3/0/7/130738919/d4a262914382286.pdfIn PDF document text
    • http://jovom.johnmcallistermusic.com/uploads/1/3/0/7/130739456/rinilolavepifono.pdfIn PDF document text
    • http://munoxamak.getbentzfarm.com/uploads/1/3/1/4/131436978/2052274.pdfIn PDF document text
    • http://files.thezezimas.com/uploads/1/3/1/1/131163846/5701210.pdfIn PDF document text
    • http://files.ccfammo.com/uploads/1/3/0/7/130775431/a3303dfff0b4b.pdfIn PDF document text
    • http://nasodi.vanessamulton.com/uploads/1/3/1/3/131380600/4598156.pdfIn PDF document text
    • http://deguzugi.imagereplicas.com/uploads/1/3/0/9/130969868/zusovuru.pdfIn PDF document text
    • http://files.misslalaphotography.com/uploads/1/3/1/6/131606431/2347ab9c39eb7.pdfIn PDF document text
    • http://vatizukin.oswestrychildminders.co.uk/uploads/1/3/1/3/131379182/5205649.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/1/0436/1591/2098/files/79970112162.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9318/0070/files/toshiba_lcd_tv_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1097/2056/files/vidalia_onion_casserole_with_cheddar_cheese.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_off0000584c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x584C 5192 bytes
SHA-256: 3186e19c1f53c9cdfc3f2a974f7c6037950807e941275c4a739cd3497ebd2014
font_01_sfnt_off000069d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69D4 10024 bytes
SHA-256: 4f40dc5919af3e6dd02b9f271fbe3e4b3332b9ca25e71cbedd40a92a3a1bf933

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