Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e1b8b5d6510e87…

MALICIOUS

PDF

43.4 KB Created: 2020-10-16 08:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4f53be04c00ed3f108fce42567049d06 SHA-1: 79862a8e99837d9ddd0dd31a69744b5dc96c5e0e SHA-256: c1e1b8b5d6510e872c8e7c763659a9749465bc78b860977d9a23517fc598a8c9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The primary purpose appears to be directing users to malicious infrastructure, likely for further exploitation or phishing. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL supports this assessment.

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://gettraff.ru/123?keyword=best+mobile+fax+app+android In PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/jasamejug-jenutuzudemeluf.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/4144282.pdfIn PDF document text
    • https://dotofinadi.weebly.com/uploads/1/3/0/7/130740455/luwotebobolobun-repugose.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369508/normal_5f8842520f2a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5f87254fe71eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f88bc62ccd37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369638/normal_5f87de46b62a6.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/1/0482/7014/7739/files/38347461202.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0971/2023/files/mortal_kombat_x_cheats_xbox_one.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2451/7790/files/articles_of_the_philippine_constitution.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5780/2137/files/xajopofoko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/2939/8182/files/fepivimidelorenunavizu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8707/1906/files/best_free_ebook_reader.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/2484/3420/files/where_to_find_lascaux_borderlands_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7314/1912/files/60177589744.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9191/3632/files/herbalism_guide_wotlk_alliance.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/3070/8129/files/24025309543.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9570/6782/files/gudovixomoja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/1560/9761/files/50253736252.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2376/4125/files/how_to_hypnotize_a_dog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f8af206-0009-4d7c-917e-5c101e8b356f/nanujole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5c79553-f797-4dd7-9357-be7f340cfd99/93393780844.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_off00006b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B0F 5444 bytes
SHA-256: 97366b226b9281e53eff394bb48f97913c9f5970eb0045779c0e558694ed7ef4
font_01_sfnt_off00007d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D78 10304 bytes
SHA-256: 317104a913755f3af278c353f0baa0f38d6668104914e3d7a3dd019ab1475ae2

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