Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c6febbb8b511d89…

MALICIOUS

PDF

42.1 KB Created: 2020-10-27 12:18:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 899901a83d4c3e3481c319efad394368 SHA-1: 1bd4293e0f9e0070da1ebb3ec742354590d6cddf SHA-256: 8c6febbb8b511d894faa1319f65ecb17136c63ba1256db251313cb841c1e3020
184 Risk Score

Malware Insights

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

This PDF document is identified as malicious due to its function as a link farm designed for SEO manipulation and redirection. It contains numerous embedded links, including one pointing to known malicious redirector infrastructure. The document body, though obfuscated, contains URLs that are likely intended to lead users to malicious sites, potentially for phishing or malware distribution.

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=english+2+released+form+answer+key+2019+nc In PDF document text
    • https://junoxavod.weebly.com/uploads/1/3/1/3/131384771/53cee7c7f75c2.pdfIn PDF document text
    • https://gumomamomav.weebly.com/uploads/1/3/1/3/131398069/d8dd6790ac3e.pdfIn PDF document text
    • https://fetibafavi.weebly.com/uploads/1/3/0/7/130776688/minunikadu_xalolusegug_valaziw_wifukatexu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384026/normal_5f8e6325a16dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381748/normal_5f8fa2e665b35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372673/normal_5f91099eb5aa0.pdfIn PDF document text
    • https://mitixofixomu.weebly.com/uploads/1/3/4/3/134333727/3598409.pdfIn PDF document text
    • https://vebifejelib.weebly.com/uploads/1/3/0/7/130775119/42183.pdfIn PDF document text
    • https://nulakumoxuguv.weebly.com/uploads/1/3/1/8/131871970/f401bd84142fad6.pdfIn PDF document text
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/d2604dc41.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/44ef773c-79c9-4feb-aebf-fcd56178efad/recipes_no_sugar_no_carbs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca3196d6-7a4c-46ae-ae55-7c8f5046c74a/75098126670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ad0ad54-8b17-4ff0-bfab-3787cbdccf7d/pirivonikuji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a79f4a30-606c-4e2c-b50c-58594434c3a1/what_is_calum_hoods_middle_name.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d85eb3cb-0377-442e-a178-053e053ac55e/sony_hybrid_handycam_dcr-dvd610_software_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c96243c-5365-4ea8-b847-4d1cac1043cb/65688282992.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45d18668-6b31-4562-86ff-509a04f4a9fd/62064880063.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f49fa9ed-be39-4efa-b539-260931ad8c79/he_is_jealous_for_me_chords.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/7179/9964/files/worksheet_present_simple_continuous.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/7220/3168/files/how_to_become_a_rainmaker.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_off000060b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60B4 6132 bytes
SHA-256: 1ddb3765e65406c5ed2549b0adfdbf373c8b0e707ff994d388ac7d742725cdfe
font_01_sfnt_off0000757c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x757C 10620 bytes
SHA-256: 50d68f088f7eb5160e0976813a87f725cf038d7dae37130b19fd4281460091bd