Malicious PDF — malware analysis report

Static analysis result for SHA-256 320bb52092feb29a…

MALICIOUS

PDF

39.8 KB Created: 2020-08-18 14:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf6a36747742e17d82394c5b2ad1086c SHA-1: a7ca21df6e75ae03915ffddaf9dc24d0235789af SHA-256: 320bb52092feb29ad9ce4cbe4a20499cc68c1536b47c499091da4faf5cc3c43e
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with the primary link directing to a known malicious redirector. The document body, though partially corrupted, includes text related to Microsoft Office and Excel, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious activity. The presence of a link farm further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=microsoft+office+creating+labels+from+excel+spreadsheet
    • http://bekowa.biologicalwasteexpert.com/uploads/1/3/2/6/132683014/0e51a6668.pdf
    • http://bijizovo.subjectmattertap.com/uploads/1/3/2/6/132681670/lirexapowi.pdf
    • http://files.zeriongroup.com/uploads/1/3/1/8/131857305/5979019.pdf
    • http://zurut.htdesigntech.com/uploads/1/3/1/3/131380213/tenanujewu.pdf
    • https://cdn.shopify.com/s/files/1/0439/8641/9870/files/lujimaroxovosexewulagifu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7078/2614/files/netuxonifofozawuvazunu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1572/4443/files/5541898377.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/manufacturing_and_automation_technology.pdf
    • https://cdn.shopify.com/s/files/1/0433/7179/0494/files/laminijavibi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/20416569062.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zinigezumapafukutogu.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_off00005df6.bin
edb8da44e67d2ef8696712484bf8b43ace4031735bc7e77ce1b0dc9b1a08de9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF6 5780 bytes
font_01_sfnt_off00007172.bin
9eb81f295942c921a0ac25cb64cd4eb3942ead31c03f352cf05d4b2b1757abfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7172 9616 bytes

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