Malicious PDF — malware analysis report

Static analysis result for SHA-256 68527a0f5e73245b…

MALICIOUS

PDF

37.9 KB Created: 2020-07-10 16:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: cad27cfaae43171fb18d29db22309d11 SHA-1: c1a3cecea6d0c979f2eccba666ad631b6578fc92 SHA-256: 68527a0f5e73245b76eb052748fc4554b1b377c5ea15416a74339f53148993ff
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable domains and are likely part of an SEO link farm. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a malicious intent behind the link farm. While no scripts were extracted, the overall structure and the presence of malicious redirector links indicate a phishing or malicious redirection attempt.

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=mathematics%20basic%20rules%20pdf In PDF document text
    • http://files.coljonesswimhurstville.com.au/uploads/1/3/2/7/132741181/9628755.pdfIn PDF document text
    • http://files.laureltherapy.net/uploads/1/3/1/3/131398164/115363.pdfIn PDF document text
    • http://files.stoneharborpawprints.com/uploads/1/3/2/3/132303126/pekuwavom_nekagepuregenu.pdfIn PDF document text
    • http://files.breedingforthefuture.com/uploads/1/3/2/6/132681566/sutavumuz.pdfIn PDF document text
    • http://files.educationalresourcesummit.com/uploads/1/3/1/8/131856770/63145.pdfIn PDF document text
    • http://files.synergybc.com/uploads/1/3/1/3/131380875/tafebujenideva-ropanigulu-tifabajive-kodajakabifaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://badupegenum.files.wordpress.com/2020/07/vupibevaw.pdfIn PDF document text
    • https://kekedox.files.wordpress.com/2020/07/19818662664.pdfIn PDF document text
    • https://zifufenusudo.files.wordpress.com/2020/07/62130704722.pdfIn PDF document text
    • https://loralamodi.files.wordpress.com/2020/06/rebokumuxaxidomevemi.pdfIn PDF document text
    • https://vivevadevage.files.wordpress.com/2020/06/50445577173.pdfIn PDF document text
    • https://tomaper.files.wordpress.com/2020/06/2721312329.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wopeg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/jorademo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/medade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/15138334831.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_off000055db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55DB 5208 bytes
SHA-256: 390c5e7b692ac985136329d313adecf4c86fd2655daede32595c583000f0ed15
font_01_sfnt_off00006786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6786 10296 bytes
SHA-256: 702fa298108733ea81d7c5e1a167fb8deb9164491188e9baf84cdc1cdc8a7fd1

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