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)
MD5: 04d0a85eaecc25244ed8d9d2bc77b20f SHA-1: e0e82d0630325d1a080c59bcd67563ddc16094b7 SHA-256: 880a9f85ae8b9338b9c29f88887a009b1439a0fb03b45bad48c27d307ff3834d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document is classified as malicious due to its use of a link farm to redirect users to potentially harmful content, specifically disguised as an owner's manual. The presence of numerous external PDF links, including one pointing to a known malicious redirector, indicates an attempt to distribute malware or lead users to phishing sites. No scripts were extracted, but the PDF structure and embedded links strongly suggest an exploitation attempt.

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://ttraff.ru/wb?keyword=subaru%20forester%202009%20owners%20manual
    • http://files.byronperry.net/uploads/1/3/1/6/131606128/5283932.pdf
    • http://files.bluebarnbbq.com/uploads/1/3/0/7/130740589/bca8965065.pdf
    • http://files.simonemaurerflute.com/uploads/1/3/1/4/131453100/3007555.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bidaleb.files.wordpress.com/2020/06/45890701441.pdf
    • https://wijekiril.files.wordpress.com/2020/06/37369633410.pdf
    • https://zifapudig.files.wordpress.com/2020/06/33394235689.pdf
    • https://fojajuxebi.files.wordpress.com/2020/06/81263412263.pdf
    • https://luxosufibip.files.wordpress.com/2020/07/dovabudisanosonudivepupex.pdf
    • https://mobulafa.files.wordpress.com/2020/07/wifeguro.pdf
    • https://fujovigu.files.wordpress.com/2020/06/maluziredos.pdf
    • https://tasazobobeg.files.wordpress.com/2020/07/22130257891.pdf
    • https://cdn.shopify.com/s/files/1/0430/6114/9850/files/lunazanexanimezol.pdf
    • https://cdn.shopify.com/s/files/1/0433/0792/5654/files/45573726844.pdf
    • https://cdn.shopify.com/s/files/1/0433/2286/7880/files/41913747942.pdf
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/15869897364.pdf
    • https://cdn.shopify.com/s/files/1/0431/1125/2132/files/maxedulusobukagapiw.pdf
    • https://cdn.shopify.com/s/files/1/0434/9391/6837/files/56724805788.pdf
    • https://cdn.shopify.com/s/files/1/0431/7442/8827/files/37990626779.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/kuzitup.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6744/files/30976657094.pdf
    • https://cdn.shopify.com/s/files/1/0429/2739/0887/files/lareno.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000641f.bin
1129a3be420bfbaf6a57471c80dbbb8599c9e5b89355f110bc9c523c2b2383f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x641F 5512 bytes
font_01_sfnt_off000076cb.bin
b088cc7852745671052862e0015312924f0899a6e187ccd82a56ec1d95166448		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76CB 10264 bytes

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