Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a5f52bbf48b2b3…

MALICIOUS

PDF

40.2 KB Created: 2020-10-22 21:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: a9eff5bcfe6e20b4a07440ad8aa8dae0 SHA-1: f3fd2baffe9aaa0685ea2d8fd6e40a2322bb7d4a SHA-256: a4a5f52bbf48b2b3316fd8d3e2a4bc7dd5b2d68b4e3ac365e3fc967856b14265
194 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://ggtraff.ru/aws?keyword=a+question+of+power+bessie+head+pdf In PDF document text
    • https://mojenosude.weebly.com/uploads/1/3/1/3/131382274/lafikaxerikadaxigaba.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/15e006e8c48f.pdfIn PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/nudanujurer.pdfIn PDF document text
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/868de9ec8.pdfIn PDF document text
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/82ce14ce.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/99edb22468a5e.pdfIn PDF document text
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/23a67755.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/2511602.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/xusasepivaf_tejerilidibus_kilefojofuvewon_wejufuwupul.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00005e3a.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00005e3a.bin)
    • https://cdn.shopify.com/s/files/1/0496/1422/5559/files/cube_world_wiki_pet_food.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5940/7765/files/regulation_of_lipid_metabolism.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5937/9875/files/wijubejebopo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7888/4759/files/mosetituxifizozuso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0544/3736/files/wwe_immortals_cheats_no_survey.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/7248/3228/files/animal_farm_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8252/0478/files/simple_genetics_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5060/5977/files/decision_making_guide_dwp.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/electrical_engineering_mcq_question_answer_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/agri_coaching_chandigarh_download.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 extracted file (font_00_sfnt_off00005e3a.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3A 5444 bytes
SHA-256: cd0fe660ef897595984e7874b524137a2fc5f10bc14c5ffee6825b798015e492
font_01_sfnt_off000070bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70BC 10800 bytes
SHA-256: 99b13d7bd9a2928deeef184332b7af3090f5039d2bcd7ba6021aa79f2c5ec8d9