Malicious PDF — malware analysis report

Static analysis result for SHA-256 84682c5dd5fb83eb…

MALICIOUS

PDF

33.3 KB Created: 2020-08-21 20:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 766d98065d277058c78ab107687243cb SHA-1: 4acb11f6a573f94ce44d97bdd5d280892654204f SHA-256: 84682c5dd5fb83eb54504025e033f294251b713d194c467c7551a97aac183505
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to a link farm designed to generate SEO traffic. One of the embedded URLs, https://ttraff.ru/pify?keyword=spinach+lasagne+sheets, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious content.

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/pify?keyword=spinach+lasagne+sheets
    • http://files.pterodactylaerospace.com/uploads/1/3/1/4/131407494/1871070.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9980/0217/files/aerofarms_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/5638/9528/files/16107085306.pdf
    • https://cdn.shopify.com/s/files/1/0433/9564/5589/files/71448896894.pdf
    • https://cdn.shopify.com/s/files/1/0444/5346/2183/files/checkmarx_jenkins_plugin.pdf
    • https://cdn.shopify.com/s/files/1/0434/9162/3077/files/paraiso_perdido_john_milton_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0436/3013/3406/files/kijemukevoniwamevizinoge.pdf
    • https://cdn.shopify.com/s/files/1/0432/5317/0339/files/vezenibikatitowozo.pdf
    • https://cdn.shopify.com/s/files/1/0462/2739/0615/files/velatupu.pdf
    • https://cdn.shopify.com/s/files/1/0444/2020/2663/files/search_files_in_windows_7.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_off00004473.bin
d16a4164fa9eba7e1450c0d9b3e5265b5fad1078c425c4d890d18f52d849ad54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4473 5200 bytes
font_01_sfnt_off0000561c.bin
560fa67cc3e10a3cb0dbf77d51c8dfbadcb4185f38ee5d694e6c117d56a1d117		 pdf-font-stream PDF embedded font (sfnt) at offset 0x561C 10260 bytes

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