Malicious PDF — malware analysis report

Static analysis result for SHA-256 695e20ce103a5501…

MALICIOUS

PDF

41.0 KB Created: 2020-10-14 00:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: bf2544f5327ab1a3e393af83cb0ad44d SHA-1: 70c3278539f7c978025b8f69bdfa6f7c27c67a77 SHA-256: 695e20ce103a550123e62b80ded1e76fc941805d6d771a942669bad08bd15eb1
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically `https://cctraff.ru/strik?keyword=ken+follett+lie+down+with+lions+pdf`. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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 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/strik?keyword=ken+follett+lie+down+with+lions+pdf In PDF document text
    • https://site-1036728.mozfiles.com/files/1036728/26724657761.pdfIn PDF document text
    • https://site-1040095.mozfiles.com/files/1040095/84418240448.pdfIn PDF document text
    • https://site-1038423.mozfiles.com/files/1038423/kegiwipubemugofexodejiw.pdfIn PDF document text
    • https://site-1039174.mozfiles.com/files/1039174/5285022396.pdfIn PDF document text
    • https://site-1036671.mozfiles.com/files/1036671/2750026842.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/8347111.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/7971455.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4caaee9f-a99a-4a42-b4c4-2cfce12fd450/97990515957.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6702c4ad-1043-44e9-aa6e-35b65a4e7257/fiwemevokuwomoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fb6112d-9b58-42d7-9b6c-81bc944852f5/jixozukatixinenet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca295c5a-1450-4b21-ba36-a6cb15bec8df/89937266552.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1582/3772/files/bajizojobivipi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7612/7394/files/concrete_fence_post_calculator.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8161/6546/files/6528598945.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3273/0008/files/ilocos_sur_polytechnic_state_college.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6893/5330/files/folizogofuvimab.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_off0000637e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x637E 4884 bytes
SHA-256: b202fb904a3e2b55c277cd774161cda5693a95f71b510f17ee9d0a92ef479d05
font_01_sfnt_off00007438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7438 10240 bytes
SHA-256: 1089dd085987b94eb99d684340ee4666c354ebde9dc8bd98e98d6a1aa5bc864b

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