Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c55ce641c90e1ac…

MALICIOUS

PDF

63.9 KB Created: 2020-09-01 11:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d3ddf5c6c03a9d3625861eacb8404d6 SHA-1: 2d55570ba3aa0578fdccb254be3d1a9e1666ec4d SHA-256: 5c55ce641c90e1ac47e22987c325edd175f55590f80c9a933f17b621f3c028b5
162 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'pay slip template ms word', suggesting a phishing lure. The presence of numerous PDF links, many pointing to Shopify, indicates a potential link farm used for SEO poisoning or distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=pay+slip+template+ms+word
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0459/7055/5047/files/gerd_silberbauer_synchronsprecher.pdf
    • https://cdn.shopify.com/s/files/1/0438/4188/0224/files/nuxetapabivakisejasis.pdf
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/pamav.pdf
    • https://cdn.shopify.com/s/files/1/0434/4905/7430/files/human_anatomy_bd_chaurasia_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/2403/9592/files/jixomanuzupuxodubiw.pdf
    • https://cdn.shopify.com/s/files/1/0432/9386/8187/files/xivemajulavumo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/whatsapp_status_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0437/2735/6056/files/rowulagusef.pdf
    • https://cdn.shopify.com/s/files/1/0430/9676/8665/files/20947695635.pdf
    • https://cdn.shopify.com/s/files/1/0431/6820/2901/files/vapaxowibilipijobuwop.pdf
    • https://cdn.shopify.com/s/files/1/0460/1158/0575/files/93381879005.pdf
    • https://cdn.shopify.com/s/files/1/0433/8620/8406/files/32118975449.pdf
    • https://cdn.shopify.com/s/files/1/0437/5127/6696/files/78942398097.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b315.bin
b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB315 2828 bytes
font_01_sfnt_off0000bd10.bin
6beaa3ac8cc41fe670c6d3bfdabceadc47acdbb49230af0553bf9b5da668a617		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD10 5300 bytes
font_02_sfnt_off0000cf12.bin
6bb9bb33e36dd28a4ed78af3ef9c907f59efc3eefae51a9912a52addd99b71b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF12 9832 bytes

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