Malicious PDF — malware analysis report

Static analysis result for SHA-256 157faf8fd98c3e3a…

MALICIOUS

PDF

43.4 KB Created: 2020-10-04 03:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 53be8aada9776ad1694eb7a8b937209e SHA-1: e78930a7e7b7df2761dae8d09070129469375793 SHA-256: 157faf8fd98c3e3a593b41bed6646dc439219668a3f177ab2acbdafe9b5f16a1
194 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=how+to+change+download+location+windows+10 In PDF document text
    • http://figoriwe.gtts.eu/uploads/1/3/0/8/130813042/labolapaz_xawebu_kabugazofiretez.pdfIn PDF document text
    • http://kukog.lisahambleton.com/uploads/1/3/1/6/131636725/bowug.pdfIn PDF document text
    • https://site-1037071.mozfiles.com/files/1037071/jipadatelusasezug.pdfIn PDF document text
    • https://site-1038717.mozfiles.com/files/1038717/95872112014.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/1/0484/2015/9640/files/slader_algebra_2_springboard.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1511/6696/files/gumballs_and_dungeons_principal_trial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/6669/3534/files/angels_of_death_manga.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3641/6936/files/bill_of_exchange_format_icici_bank.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2793/1034/files/forms_of_government_scenarios_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f51e5196-0a88-4207-a25e-c161118dc478/26549090840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70c93c65-6594-4b6a-aadb-449bdf3c3e38/92752580131.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_off00006b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B8D 5352 bytes
SHA-256: ae602f7c0013203b6f048c28c8d60727311992273dd7e0031d39bbf10611c34f
font_01_sfnt_off00007dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD5 10352 bytes
SHA-256: 67982ba3ac25ffaaba88a3668c893febfe6872c8be7788dd52cac727cc553323