Malicious PDF — malware analysis report

Static analysis result for SHA-256 3281b7db0c2861d4…

MALICIOUS

PDF

38.5 KB Created: 2020-11-09 11:03:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5db157c49495fc553707678fd0741ba5 SHA-1: 9e0917c30a4d43c25968e581014cdb9bc6fdef08 SHA-256: 3281b7db0c2861d4ff26994ef1bd85a334e583cc135d10ec042d86bdf294d375
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links to external PDF files, many hosted on disposable domains, which is characteristic of SEO link farming. One of these links directs to known malicious redirector infrastructure, indicating a potential phishing or malware distribution attempt. No scripts were extracted, but the structure suggests the PDF is designed to lure users to malicious sites.

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://traffking.ru/aws?keyword=1999+yamaha+bear+tracker+parts+manual In PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/8554420.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://najoluni.files.wordpress.com/2020/11/gri_kurt_mp4_indir.pdfIn PDF document text
    • https://ligesopalod.files.wordpress.com/2020/11/16689141781.pdfIn PDF document text
    • https://saresuzir.files.wordpress.com/2020/11/webzen_mu_online_leveling_guide.pdfIn PDF document text
    • https://luxuwalup.files.wordpress.com/2020/11/85353679324.pdfIn PDF document text
    • https://botebofeji.files.wordpress.com/2020/11/15963812645.pdfIn PDF document text
    • https://buzalij.files.wordpress.com/2020/11/best_custom_zombie_maps.pdfIn PDF document text
    • https://dolenukiwiwe.files.wordpress.com/2020/11/72041312243.pdfIn PDF document text
    • https://xilikiliv.files.wordpress.com/2020/11/chemistry_study_material_for_iit_jee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0531b542-6dfc-46fb-bd42-203eda0efb62/pokemon_strategy_guide.pdfIn PDF document text
    • https://turasugi.files.wordpress.com/2020/11/biblical_family_tree.pdfIn PDF document text
    • https://zepegegudo.files.wordpress.com/2020/11/cryptocurrency_for_dummies_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/66340194007.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/gipoma.pdfIn PDF document text
    • https://lodoxepal.files.wordpress.com/2020/11/vibinofa.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_off00005409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5409 5592 bytes
SHA-256: ba56a66f4577971d8055ce9abb36ab68eaf82198e8d3512c7e93a891ad5ff87a
font_01_sfnt_off000066e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66E6 11280 bytes
SHA-256: d5ec532b73a3978b46e86fc99645aa6d026a6717a53eb810105fc644d7ec8154

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