Malicious PDF — malware analysis report

Static analysis result for SHA-256 e188bfa4e18287ff…

MALICIOUS

PDF

46.0 KB Created: 2020-07-15 00:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 89c55741d2a7a32367e0e8cda92f3af4 SHA-1: ce02dd52407f1a48162712af46a3154ca7bc409a SHA-256: e188bfa4e18287ff7ee5a816d8fbd54d9c2e5988749bf0a76fce19b38dfa82d0
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a critical heuristic firing indicating it links to a known malicious redirector. Additionally, it features a mass external PDF link farm, suggesting a tactic to manipulate search engine results or distribute malicious content. The embedded URLs are likely used to lure users into clicking on malicious links, potentially leading to further compromise.

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://ttraff.ru/wb?keyword=esc%20syncope%20guidelines%20pdf In PDF document text
    • http://files.shoptrueblessings.com/uploads/1/3/1/3/131381900/novifovowosoxesupo.pdfIn PDF document text
    • http://files.clendenning.com/uploads/1/3/2/6/132680955/2897816.pdfIn PDF document text
    • http://files.lauraavnaim.com/uploads/1/3/0/9/130969819/0ec2ee5.pdfIn PDF document text
    • http://files.fhwellness-ca.com/uploads/1/3/1/4/131453214/suxazivujugi.pdfIn PDF document text
    • http://files.rekindlebylisa.com/uploads/1/3/1/8/131857580/rorewomido_gatexido_dagogezak_gatuvijotosotis.pdfIn PDF document text
    • http://files.beenwheredonethat.com/uploads/1/3/0/7/130739251/raxetoribev.pdfIn PDF document text
    • http://files.maarch.net/uploads/1/3/1/4/131437504/suvonozu_xebeta.pdfIn PDF document text
    • http://files.clayassociates.org/uploads/1/3/2/7/132712040/b04fa3622f7f96.pdfIn PDF document text
    • http://files.budrejko.org/uploads/1/3/2/7/132740337/kukujapuza_nibamibepisa_mosudi_gakoromoxemaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://vevumoruv.files.wordpress.com/2020/06/xakuwesika.pdfIn PDF document text
    • https://naruxodusuv.files.wordpress.com/2020/07/nagakajevanigur.pdfIn PDF document text
    • https://zisepata.files.wordpress.com/2020/06/67070697955.pdfIn PDF document text
    • https://jitazip.files.wordpress.com/2020/07/36110615061.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54313135065.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9732/5732/files/tibedaguzazefudiwupokiwe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7192/2591/files/73777683556.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4927/1975/files/18034323651.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4028/5607/files/69114526111.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9236/1887/files/29300038821.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46605756913.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_off000076a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76A7 4880 bytes
SHA-256: bf06afc7d2a486f29efb2b00a22e32dcd739dab3cd8ee65b2a004b1c6fe4fcf7
font_01_sfnt_off00008756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8756 10252 bytes
SHA-256: 212bbac3462b106089b40c8357e937664b631837035fe685d4ed0e88cec9adb4