Malicious PDF — malware analysis report

Static analysis result for SHA-256 116eb1393dec5605…

MALICIOUS

PDF

41.2 KB Created: 2020-09-30 09:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b3077d60797d28b771e2aa0367078880 SHA-1: 2db09cfb3832ad8fb4467618544eb37f7e23a237 SHA-256: 116eb1393dec56058531b335d39bdf5053406978e357f0ce7b50f76a0f39c4c3
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on disposable domains. One of the URLs is identified as a known malicious redirector, indicating a potential phishing or malware distribution scheme. The ML classifier also strongly flagged this PDF as malicious.

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://ggtraff.ru/strik?keyword=meningoencephalitis+treatment+pdf In PDF document text
    • http://basedi.clearwatersrealty.com/uploads/1/3/0/7/130776023/8011487.pdfIn PDF document text
    • http://files.adrienneisakovic.com/uploads/1/3/1/4/131437283/85f3bb109.pdfIn PDF document text
    • http://tazowur.quikartist.com/uploads/1/3/0/7/130739616/wugif.pdfIn PDF document text
    • http://datemutev.chriseberhardt.net/uploads/1/3/2/3/132303127/3604684.pdfIn PDF document text
    • https://site-1036734.mozfiles.com/files/1036734/tavefovegemifi.pdfIn PDF document text
    • https://site-1037890.mozfiles.com/files/1037890/13233848038.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/71b5c698-27ab-4572-9503-8f44f934cb72/51346807146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7458c94-4218-4f29-a865-a42e6fd46c0d/karevapifavovevub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e621f7e0-26df-4424-b0d3-632dadd43f59/ropofazuritebumuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3e6fcc8-0d4b-4fb2-a59f-51b348f559c2/jarajawanironajivekav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gomejalubewetilukifij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/1767/7211/files/if_i_did_it_confessions_of_the_killer_summary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3850/7169/files/nezumi_no_sum.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_off00006334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6334 5572 bytes
SHA-256: 48bd1b01ed5a5fd31fa19851e5f5a6aa4dd3657fe13ca2d211f4c6f8b75769b7
font_01_sfnt_off0000760e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x760E 9980 bytes
SHA-256: 46b84b57328e9b4637db1fbd5af106956eaa0e214321b646d6b7c8d58a67776b

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