Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4da7c382d10e138…

MALICIOUS

PDF

54.3 KB Created: 2020-10-16 09:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c51c4d68fcfe1d95281262b23f357d77 SHA-1: 578d05e96f3e77a36920c608f35ba5d831a5fc19 SHA-256: d4da7c382d10e1389c302f97ff783d11e5830438743ece293a106d7953916d2d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external websites, a technique often used to manipulate search engine rankings and redirect users to malicious content. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to a redirector, and 'PDF_SEO_LINK_FARM' indicates a mass of links for SEO purposes. The ML classifier also strongly indicates 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://gettraff.ru/pify?keyword=pdf+size+reducer+apk In PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/lixavej_rivutavipulox_vunezikavad_lirumonoguwako.pdfIn PDF document text
    • https://worobewunit.weebly.com/uploads/1/3/1/4/131406731/4542247.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/3156467.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/wawebore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366628/normal_5f876d9f707e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_5f88d92c758a6.pdfIn PDF document text
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/raxasiwilabapu-vasek-wuvagukolokuzug.pdfIn PDF document text
    • https://vuxilimibipemop.weebly.com/uploads/1/3/1/4/131453056/midofajewugawapu.pdfIn PDF document text
    • https://remewizefo.weebly.com/uploads/1/3/1/8/131856163/jezowogabusot_dajuxax_peloxidinivolup_foxilabeleturak.pdfIn PDF document text
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/porepuri.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/7d3707d5d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0602eec4-283f-4187-9627-199539f91a74/rumopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3609bbd-38d3-46dc-8e67-897c4a8a7dd6/wewuvinobefubasidawem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0426/3585/files/52615065732.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/2953/6151/files/airtel_broadband_plans_coimbatore.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2007/4663/files/99014909960.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/7113/5644/files/the_cost_of_electricity_worksheet_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A32 4816 bytes
SHA-256: b2855922ee41f61e49bccd732f8d3363a7687b2c28002a4a313967aff2e01d58
font_01_sfnt_off00009aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AAA 10584 bytes
SHA-256: 1ad5c1a0319f98ec8584ccf8c8549b6dbd265a3188f625b690833eebd59be043
font_02_sfnt_off0000bddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDD 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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