Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53a581b890e38b9…

MALICIOUS

PDF

39.8 KB Created: 2020-08-12 10:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d77fe2db30acbf5061fb15af96794f57 SHA-1: 25d9d50b5716d22cf55aa7d8cd3b180ab3102dd0 SHA-256: f53a581b890e38b93052f30a8b5acfd3d4c75dd46eecdbd52d95541ade962f28
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external sites, indicating a link farm designed to manipulate search engine rankings or lure users to malicious destinations. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. No scripts were extracted, limiting the analysis of direct payload execution.

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/wb?keyword=drilling%20and%20blasting%20mining%20pdf
    • http://zuvusake.fpyc04furysoccer.com/uploads/1/3/1/6/131637136/c0daf9ff2e29.pdf
    • http://files.worldtravelingfeet.com/uploads/1/3/1/1/131164488/9b411518b8c9.pdf
    • http://kenixila.slcwrestling.com/uploads/1/3/1/0/131070374/gikirezuzap-sogogogi-wonimiligitigav-kujatetiw.pdf
    • http://files.koldenpianolessons.com/uploads/1/3/2/6/132682076/d9e2637.pdf
    • https://cdn.shopify.com/s/files/1/0430/4407/7722/files/python_graphical_user_interface_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0431/0577/9863/files/gukerorakofuzaziwod.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0302/files/wofarodejexi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/fowobo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8941/2764/files/pitotavosi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5122/1146/files/lewugadin.pdf
    • https://cdn.shopify.com/s/files/1/0427/9504/0924/files/marvel_encyclopedia_updated_and_expanded_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/9217/3217/files/motuxufipogibevubolavoxuf.pdf
    • https://cdn.shopify.com/s/files/1/0434/0737/6542/files/woxefusunazumumifi.pdf
    • https://cdn.shopify.com/s/files/1/0450/9224/1560/files/pathology_textbook_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/1519/0181/files/moparenaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3862/files/pekitazakoxesufomitew.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_off00005d6d.bin
4e2ee285bc2adf46e5949428013e4ac711cf56e6008e029a622d1bdae2c20382		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D6D 5500 bytes
font_01_sfnt_off00007000.bin
9926642baf5d259b600e7606c7feee8a1a45049f0df817aa9b399550a97df60a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7000 10068 bytes

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