Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b51439ef60af20f…

MALICIOUS

PDF

41.6 KB Created: 2020-10-27 04:44:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b36e5e4424d696046cd1c8e9bd895328 SHA-1: d6d7aa796b388ee04cde76d8cee74c798e230eb0 SHA-256: 3b51439ef60af20fa64f6a82e9fa5b6e780a17e6f7612c88f560056045822b59
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm designed to drive traffic to malicious sites. The ML classifier strongly flagged this PDF as malicious. The embedded URLs, such as 'https://cctraff.ru/strik?keyword=bissell+handheld+vacuum+walmart', are likely part of a phishing or scam campaign.

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=bissell+handheld+vacuum+walmart In PDF document text
    • https://taxajadotediru.weebly.com/uploads/1/3/0/8/130873824/zutabolom-neritevi-wapatokilab-nilelebatojo.pdfIn PDF document text
    • https://folemazilepi.weebly.com/uploads/1/3/1/1/131164248/sofikerilux_dawewirorolozu_zabosegisezaf.pdfIn PDF document text
    • https://buziratefe.weebly.com/uploads/1/3/4/3/134354065/xurolid_gemelatixa_zoxelitog.pdfIn PDF document text
    • https://kidunaxu.weebly.com/uploads/1/3/1/4/131437100/wovuvekow.pdfIn PDF document text
    • https://sofuwikomu.weebly.com/uploads/1/3/4/3/134308783/tuxosima-wupot-konasesipezup-wuditosat.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/mepuxotu-bowukapubisoriw.pdfIn PDF document text
    • https://misikeni.weebly.com/uploads/1/3/4/3/134336029/jagesutaneda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369638/normal_5f8d7feae2f37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369645/normal_5f93fdce2d9a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367921/normal_5f966aa1291aa.pdfIn PDF document text
    • https://delimilakemasuj.weebly.com/uploads/1/3/4/4/134400920/6641303.pdfIn PDF document text
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/120c0bf62c84.pdfIn PDF document text
    • https://disaxugotusineg.weebly.com/uploads/1/3/1/8/131871710/rodijixub.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/1/0266/9605/7019/files/5-3_practice_bisectors_in_triangles_form_g_answers_with_work.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/2854/7237/files/best_video_recording_android_phone.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4880/7831/files/gta_san_andreas_lite_cleo_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/lavivufanamoxetekilob.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/8493138712.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/black_holes_and_baby_universes_and_other_essays.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/sibebekonef.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_off0000641a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x641A 5380 bytes
SHA-256: 017e57130c4b490b37a360a168941a5623410b2a54e0bbe67b9b9ce779bba1f5
font_01_sfnt_off0000763e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x763E 10296 bytes
SHA-256: f1f5e227540d5ce98afbbf85f4c1ca9d9849f9cf120bf090e679adf44b0280a7