Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a825dd5e419cd09…

MALICIOUS

PDF

49.9 KB Created: 2020-10-28 22:16:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e751042aa9e3edf097dc187ea4b08c0a SHA-1: bdf25dd042731606843361ddedf83641d697661a SHA-256: 0a825dd5e419cd091c5baca4791bac6c4a1b6e981aac64d9a93878160ec830c0
184 Risk Score

Malware Insights

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

The PDF document contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains a URL that likely serves as the initial lure. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests a campaign to distribute malware or conduct phishing.

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=lesson+3.1+assignment+answers In PDF document text
    • https://lokixesope.weebly.com/uploads/1/3/1/6/131607163/puluxa.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/belufokomodosijimona.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/1469848.pdfIn PDF document text
    • https://jawiniralegewo.weebly.com/uploads/1/3/4/4/134492986/mamimotivopi_nakijepubul_danoxixe.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/5650151.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/sesabifeto-jafavefixoguzo-porukefojek.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/vobusuvuzupabu_telobe_xivonamubaj.pdfIn PDF document text
    • https://derodaju.weebly.com/uploads/1/3/1/6/131606282/ae413c2dd30e6.pdfIn PDF document text
    • https://wodedofa.weebly.com/uploads/1/3/4/3/134320626/9633374.pdfIn PDF document text
    • https://zilavexeredora.weebly.com/uploads/1/3/0/8/130874610/46031f6ce.pdfIn PDF document text
    • https://zejibafubetu.weebly.com/uploads/1/3/4/1/134108860/3acd9cf91796.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/1/0497/2468/6493/files/area_code_310_prefixes.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/feminist_liberation_theology.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0105/2836/files/kitchenaid_under_counter_ice_maker_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/kifedagazaru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5591/2862/files/eric_carmen_songs_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9050/0001/files/mengubah_file_ke_word_di_hp.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/98015860619.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/megupel.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_off00008352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8352 5252 bytes
SHA-256: 169b7a9593b385b5e46d94549979fe7eb6b5c905efcf000f9bc41ec9d4aef465
font_01_sfnt_off0000953c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x953C 10852 bytes
SHA-256: fbf0aeb8aa95ace7e002808f30183cad09e23bde91c9f61c90b7eef8f6f57c3b