Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5ea6081fe570bc…

MALICIOUS

PDF

46.5 KB Created: 2020-10-10 08:40:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: f5d0156ecf83b7a20590dc7eaa0fcd78 SHA-1: bb599e71d2f2bef2b8b69500a5ccac7e133160b3 SHA-256: 5e5ea6081fe570bc46b7d7e791c90f5adcaa79d619f7018e61ad5dc7b6e90e27
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the URL https://ggtraff.ru/strik?keyword=summon+instrument+pathfinder, which is also flagged as a malicious redirector. The presence of many links suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=summon+instrument+pathfinder In PDF document text
    • https://site-1044057.mozfiles.com/files/1044057/vomojogulo.pdfIn PDF document text
    • https://site-1042824.mozfiles.com/files/1042824/59345325368.pdfIn PDF document text
    • https://site-1039183.mozfiles.com/files/1039183/77794499740.pdfIn PDF document text
    • https://site-1048452.mozfiles.com/files/1048452/runatajavunesav.pdfIn PDF document text
    • https://site-1044164.mozfiles.com/files/1044164/43858272987.pdfIn PDF document text
    • https://site-1043170.mozfiles.com/files/1043170/tumubukisapebip.pdfIn PDF document text
    • https://site-1040125.mozfiles.com/files/1040125/jesovigimodidaru.pdfIn PDF document text
    • https://site-1044515.mozfiles.com/files/1044515/91560050956.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/1/0431/8052/3681/files/chemical_nomenclature_worksheet_name_the_following_compounds.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8547/1656/files/the_century_americas_time_a_new_world.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2990/8637/files/meyer_niles_west.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8932/1366/files/cw_channel_number_fios.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6353/6533/files/cisive_background_check_status.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2461e117-bb23-4460-baea-d65169eddafc/73514016382.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9631c3a3-2bcf-4276-89b2-297b75b953e2/62847063013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7bd7fd0-ae31-4b25-957c-356f098c5f5a/gupikupuvodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/352ce128-471f-4a57-8ad8-0f892474bbd5/porefonaluxeketowupimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfafe1db-614f-481a-85fd-e4b6f4a63285/33043414398.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_off00007701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7701 5352 bytes
SHA-256: 0c39d393f1cea213d243b170dcf0e95c3c6df4b0e05d25a4302a8e88d0dd6414
font_01_sfnt_off00008909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8909 10564 bytes
SHA-256: 1f7d8aa7f55415d05046d993c671f9c476f73a963cbe64c2eef3f14222675091

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