Malicious PDF — malware analysis report

Static analysis result for SHA-256 23dd7f1ed5699a97…

MALICIOUS

PDF

42.7 KB Created: 2020-08-08 18:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb3cd4011d1c7ea9e5310534a5ed3859 SHA-1: a8d4ed385ceac57749cfe084317f01937c84d057 SHA-256: 23dd7f1ed5699a972838ce55d01eeb20aa4882ee9b34b27cbf5949ad9686daa8
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lure users to further malicious content. The document body, though heavily obfuscated, contains the same URL and appears to be a lure related to 'alcoholismo cronico'. The PDF also hosts a large number of external links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic to distribute the malicious content. No scripts were extracted, but the primary attack vector is the malicious redirector link.

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.com/pify?keyword=alcoholismo+cronico+pdf
    • http://files.seriousleisure.net/uploads/1/3/0/7/130775413/xebopo.pdf
    • http://gamowi.laffpathways.com/uploads/1/3/1/4/131406717/6394135.pdf
    • http://files.sheshcontractorsandbuilders.com/uploads/1/3/1/4/131438056/pamot_tusewaronevib_vurug_jixuwomibu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6842/3334/files/red_black_tree_deletion.pdf
    • https://cdn.shopify.com/s/files/1/0433/3119/0952/files/basic_marketing_research_malhotra_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/7338/8190/files/40656580592.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/80568034932.pdf
    • https://cdn.shopify.com/s/files/1/0430/1894/4665/files/57633027554.pdf
    • https://cdn.shopify.com/s/files/1/0433/4462/5822/files/jogosagafakipapuxakifelu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9227/1519/files/petadubogunowarofazonil.pdf
    • https://cdn.shopify.com/s/files/1/0429/0553/4620/files/python_read_json.pdf
    • https://cdn.shopify.com/s/files/1/0431/5129/4628/files/nakijiporanewakijogisup.pdf
    • https://cdn.shopify.com/s/files/1/0436/0011/7928/files/zirorodalizudejovulevazo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6818/6015/files/27177154082.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d49.bin
390cff937613693cfa09cebaaa54f08ff11a4cac8dacc56d8d4749b847d6e29f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D49 4764 bytes
font_01_sfnt_off00006d2f.bin
266547e8a02d4aea6f6272f007f95ebffc6be8cb1cf8055bf90ff4e491f2c65f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2F 10252 bytes
font_02_sfnt_off00009026.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9026 4324 bytes

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