Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e9613cb03d15e6…

MALICIOUS

PDF

46.4 KB Created: 2020-10-27 07:28:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 56677e9eeab13ae0563e510efd19d249 SHA-1: 98365ccbf90b0148b329f1a1b93a999485bda6c9 SHA-256: 98e9613cb03d15e6348c08c33e70688054d3ba9aa89968a2f80a54d82cb75ef2
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, a common tactic for SEO link farms and phishing campaigns. One of the primary links, 'https://cctraff.ru/strik?keyword=wise+onion+rings+vs+funyuns', is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting an attempt to direct users to malicious content. The ML classifier also strongly indicated maliciousness.

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://cctraff.ru/strik?keyword=wise+onion+rings+vs+funyuns In PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/038885c85ecf8f0.pdfIn PDF document text
    • https://rasagarus.weebly.com/uploads/1/3/4/4/134452949/vovivejujiwulox-wital-bekalo.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/83905a54a030772.pdfIn PDF document text
    • https://konanofekevofi.weebly.com/uploads/1/3/4/3/134367310/2255e5.pdfIn PDF document text
    • https://mipolapepel.weebly.com/uploads/1/3/4/3/134395859/duwuv-zoluzotalak-jokitanirobek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368975/normal_5f89a6b13582d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403808/normal_5f923a0cc1771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381294/normal_5f92f21aa82df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377400/normal_5f8b2f358c7a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366362/normal_5f8722aa6449c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376374/normal_5f8aaa029cec4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368949/normal_5f8f54bbc93c6.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/1/0433/4583/8248/files/ethical_decision_making_in_social_research.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/0276/2658/files/gallery_photo_video_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9623/4902/files/84592360389.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5289/8739/files/fipoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3140/3423/files/12023096814.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5940/7765/files/vanivadefivifuzu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/1221/0844/files/89234161335.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000605e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x605E 4868 bytes
SHA-256: af90eb6624d5a533921894c3cf5f557438b9db84be5082e457c988b4d3586596
font_01_sfnt_off0000711b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x711B 11236 bytes
SHA-256: 242b7932b5f8f0287b0dc64629735af98db43285d0593f78ecdf1481c87a0140
font_02_sfnt_off0000979d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x979D 16060 bytes
SHA-256: 5b45d8957cdd618c0f157c507058aef1810e6158bb3d1abf257796d6008f54d1

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