Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f0251a0a502d91…

MALICIOUS

PDF

62.8 KB Created: 2020-10-30 14:09:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b858431cb51cab1d6dccaf86d2363afc SHA-1: 27027dc622d747590c2017732af20def889e86e6 SHA-256: 22f0251a0a502d91bd1366468c83f558b50f6178ca4e14bab5dba31e9ac2896e
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm designed to attract traffic. One prominent URL, 'https://ttraff.ru/123?keyword=ichigo+new+bankai+fanfiction', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, reinforcing its role as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/123?keyword=ichigo+new+bankai+fanfiction In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378856/normal_5f8bc22583477.pdfIn PDF document text
    • https://sofakixejiz.weebly.com/uploads/1/3/4/2/134265497/jabas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418590/normal_5f9b8270ce8b9.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/viruxumabepedi_sulifupunapesor_gegimutajatevar_gamuwewobavowaw.pdfIn PDF document text
    • https://natorepoxikafop.weebly.com/uploads/1/3/4/3/134314237/nopenuke.pdfIn PDF document text
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/demajawugijudo_narasobabuson.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373509/normal_5f8ebe95081a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375894/normal_5f906a38b4b45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5f8e4538efb98.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/1/0502/0775/2343/files/vefekerozope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7b77a15-06ad-48f7-a455-65270b58f68f/wodutebinijalimeduxekiseb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8155/1016/files/dizexurefupan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/5958/2373/files/how_to_write_a_memorandum_army.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4114/7038/files/26517274348.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/3567/8614/files/mujupanezogope.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_off0000ba16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA16 5072 bytes
SHA-256: 18abb6f08cba89083d884e49848f49aa7aab433ed8139a244567472dc210ca43
font_01_sfnt_off0000cb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7A 10132 bytes
SHA-256: 2c53f3e788b2e92be1554449e2d3e3115071c8d3442edea3868c63ecc7402866

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