Malicious PDF — malware analysis report

Static analysis result for SHA-256 880a9f85ae8b9338…

MALICIOUS

PDF

41.9 KB Created: 2020-07-17 08:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 04d0a85eaecc25244ed8d9d2bc77b20f SHA-1: e0e82d0630325d1a080c59bcd67563ddc16094b7 SHA-256: 880a9f85ae8b9338b9c29f88887a009b1439a0fb03b45bad48c27d307ff3834d
194 Risk Score

Malware Insights

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

The PDF file contains numerous links to external PDFs, masquerading as an owner's manual to entice users. The primary redirector URL, 'https://ttraff.ru/wb?keyword=subaru%20forester%202009%20owners%20manual', is flagged as malicious and leads to a link farm designed to distribute more malicious content. The ML classifier strongly indicates maliciousness, and the overall structure suggests a phishing or malware distribution scheme.

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=subaru%20forester%202009%20owners%20manual In PDF document text
    • http://files.byronperry.net/uploads/1/3/1/6/131606128/5283932.pdfIn PDF document text
    • http://files.bluebarnbbq.com/uploads/1/3/0/7/130740589/bca8965065.pdfIn PDF document text
    • http://files.simonemaurerflute.com/uploads/1/3/1/4/131453100/3007555.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bidaleb.files.wordpress.com/2020/06/45890701441.pdfIn PDF document text
    • https://wijekiril.files.wordpress.com/2020/06/37369633410.pdfIn PDF document text
    • https://zifapudig.files.wordpress.com/2020/06/33394235689.pdfIn PDF document text
    • https://fojajuxebi.files.wordpress.com/2020/06/81263412263.pdfIn PDF document text
    • https://luxosufibip.files.wordpress.com/2020/07/dovabudisanosonudivepupex.pdfIn PDF document text
    • https://mobulafa.files.wordpress.com/2020/07/wifeguro.pdfIn PDF document text
    • https://fujovigu.files.wordpress.com/2020/06/maluziredos.pdfIn PDF document text
    • https://tasazobobeg.files.wordpress.com/2020/07/22130257891.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6114/9850/files/lunazanexanimezol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0792/5654/files/45573726844.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2286/7880/files/41913747942.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/15869897364.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1125/2132/files/maxedulusobukagapiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9391/6837/files/56724805788.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7442/8827/files/37990626779.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/kuzitup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7316/6744/files/30976657094.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2739/0887/files/lareno.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_off0000641f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x641F 5512 bytes
SHA-256: 1129a3be420bfbaf6a57471c80dbbb8599c9e5b89355f110bc9c523c2b2383f7
font_01_sfnt_off000076cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76CB 10264 bytes
SHA-256: b088cc7852745671052862e0015312924f0899a6e187ccd82a56ec1d95166448