Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6b8ea94fd7f6f3…

MALICIOUS

PDF

49.0 KB Created: 2020-08-30 09:40:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d0d58f926d573148bdb34376c2dba66 SHA-1: 3656c261fd38521820f98c6ba81331e57a6c1c43 SHA-256: 8b6b8ea94fd7f6f37df10778019063ae2926a220f0f69a784a72ec3715264c13
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to other PDF documents. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.ru'. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of outbound links, including one to a known malicious domain, suggests an attempt to manipulate search engine results or distribute malicious payloads.

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/wix?keyword=shima+luan+sexy
    • https://cdn.shopify.com/s/files/1/0432/5621/7750/files/zozaji.pdf
    • https://cdn.shopify.com/s/files/1/0439/6879/0686/files/wojizeleranazurexom.pdf
    • https://cdn.shopify.com/s/files/1/0437/5255/4657/files/rodado.pdf
    • https://cdn.shopify.com/s/files/1/0450/9886/0707/files/kadavixozakanizojuzozu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7382/2115/files/69308769385.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/98592309970.pdf
    • https://cdn.shopify.com/s/files/1/0437/7768/7701/files/39737594402.pdf
    • https://static.usrfiles.com/ugd/c1615c_c959243455dc4809ab5dcb15942e3e8f.pdf
    • https://static.usrfiles.com/ugd/b8c837_baf03b0f78af4595a2ef86900b87d4ac.pdf
    • https://static.usrfiles.com/ugd/defdb4_d15f6590c1f94b36aa7159dda0733d2d.pdf
    • https://static.usrfiles.com/ugd/ade4e6_ab470d76910d477694b53c670425761c.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000083d8.bin
af9c937e494d5f209a82a836033982c42931735b812c2546868685c35b63eb78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83D8 5100 bytes
font_01_sfnt_off00009516.bin
fb16308bb5547cd73141838b43ea263d0c1c506771b7b6464ad2c4692c540ae2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9516 10080 bytes

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