Malicious PDF — malware analysis report

Static analysis result for SHA-256 00d92c2773b95db0…

MALICIOUS

PDF

34.9 KB Created: 2020-10-14 23:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0e84dfe44fba2e2d41284fdbba8e89ce SHA-1: 6d97112d84436d75484b8d60116b5e6afac7ee3d SHA-256: 00d92c2773b95db0c04f8d7579493260a91a184b82f5bed19fa38d6319598ffd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. One of the embedded URLs, https://cctraff.ru/123?keyword=wordbook+english+dictionary+apk, is identified as a malicious redirector, indicating a potential phishing or malware distribution attempt. No scripts were extracted from this sample.

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/123?keyword=wordbook+english+dictionary+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f86f7560123d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5f874a14a4067.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366402/normal_5f871b85ae894.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f8718e221559.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_5f871ce6a8387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f87150701df9.pdfIn PDF document text
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/8502473.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/batagebexi.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/duwivif.pdfIn PDF document text
    • https://rezizeme.weebly.com/uploads/1/3/0/7/130775554/8d959c.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/a63fb.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/1/0467/7468/1753/files/josokitasuwot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/1484/9190/files/pusedovizak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/585cdf20-fe93-420f-9ba0-9c1c1bbb0b38/kekojubatuwoxikulebijojiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18418108-87d8-4326-83e2-7884a83d4b48/gadilenanesevoruxer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/481d687c-6fee-4721-8393-f2c8243bdab6/zomatudimugufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88e8ff25-dc9d-488a-9063-71749aea0469/nizosekudowe.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_off00004a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A98 5656 bytes
SHA-256: 573e2cdca85846744155bfb9ff782a4a045b171f3d0cf4f4108df9ed3d7278a6
font_01_sfnt_off00005de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE4 9616 bytes
SHA-256: 1ea0181c9001a0f4e048b6e6cd8c27c024f85e2e6d2deae7bc2b25b98a536e15

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