Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cbf469477bb24af…

MALICIOUS

PDF

56.9 KB Created: 2020-10-07 12:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: d3e693dbcbb259fc9c50ca6b5f85c725 SHA-1: 9ed281caeaeed247b1c4242f30626a8f47bb23e9 SHA-256: 3cbf469477bb24af952b0edbd1602b48800cc679c8e0b0a8ec15a9558026c63b
184 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.
  • 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=catecismo+romano+em+portugu%25C3%25AAs+pdf In PDF document text
    • https://site-1036756.mozfiles.com/files/1036756/48797383396.pdfIn PDF document text
    • https://site-1039179.mozfiles.com/files/1039179/56436889564.pdfIn PDF document text
    • https://site-1036985.mozfiles.com/files/1036985/79131729338.pdfIn PDF document text
    • https://site-1039529.mozfiles.com/files/1039529/64569657525.pdfIn PDF document text
    • https://site-1037115.mozfiles.com/files/1037115/3210239384.pdfIn PDF document text
    • http://darudos.adventuresaroundscotland.com/uploads/1/3/2/6/132682076/1002543.pdfIn PDF document text
    • http://files.inseason.info/uploads/1/3/0/7/130738614/2135317.pdfIn PDF document text
    • http://files.catholicsinaldeburghandleiston.org/uploads/1/3/1/4/131406435/1528207.pdfIn PDF document text
    • http://vevifar.chalmettecoc.org/uploads/1/3/0/7/130739883/xivexas_wasevigizeto_gonuzeb_mobiga.pdfIn PDF document text
    • http://fetut.iesvschristians.com/uploads/1/3/1/6/131606563/5776999.pdfIn PDF document text
    • http://files.cakesfromthelakes.com/uploads/1/3/0/7/130739718/cd00b5df650f2.pdfIn PDF document text
    • http://files.cuttingboardswi.com/uploads/1/3/0/7/130739214/4394044.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/1/0486/3456/0670/files/koala_life_cycle_video.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/2666/5631/files/elements_of_a_graphic_novel_activity_2.7_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6257/2696/files/62662895486.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/7342/9661/files/apprehensive_feeling_in_a_sentence.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_off000096db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96DB 5496 bytes
SHA-256: 9f0b52db98869089cdf963a3d851ce9266997ee711d3c093416032cc255129f4
font_01_sfnt_off0000a932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA932 14728 bytes
SHA-256: 1003edfbe65afb2b154fe0cacb2d7ca6f86fefafbee432878ae9f01f43c4d25c

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