Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3bb09be866c53d…

MALICIOUS

PDF

49.6 KB Created: 2020-08-30 07:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8b7df0f7d383598f0ba52093f2c69ff SHA-1: db562504f8a2fbbba2d20982c2ea9f45503b20b5 SHA-256: 5a3bb09be866c53d874f33700786a1a337dfe64fb7a8fb50f6872d936e2ab736
154 Risk Score

Malware Insights

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

This PDF document contains a link farm, with numerous embedded links pointing to external PDF files. One of these links, 'https://ttraff.ru/wix?keyword=toram+online+leveling+guide+1-+180', is identified as a malicious redirector. The document's content, though heavily obfuscated, appears to be a lure related to 'Toram online leveling guide'. The presence of a malicious redirector indicates an attempt to lead the user to harmful 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/wix?keyword=toram+online+leveling+guide+1-+180
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/906e9f_4df4708bfd904a3fb6375453be281989.pdf
    • https://static.usrfiles.com/ugd/516793_4445a9048bd34cccba2859843ef29ad9.pdf
    • https://static.usrfiles.com/ugd/9e41f0_aeb02e2a81e549ae97599c0abe023e11.pdf
    • https://static.usrfiles.com/ugd/b8c837_a7318f5f86d74ce6b90b071dcefc3fb6.pdf
    • https://static.usrfiles.com/ugd/63d3ad_331a08f1783d44bb80c71f8bea929211.pdf
    • https://static.usrfiles.com/ugd/b8c837_a09ddbb188c44881a8a6ffc2f87c92af.pdf
    • https://cdn.shopify.com/s/files/1/0440/6896/2469/files/17376768326.pdf
    • https://cdn.shopify.com/s/files/1/0430/9850/5377/files/ferojevunenebub.pdf
    • https://cdn.shopify.com/s/files/1/0436/2970/7422/files/banking_service_chronicle_may_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ziwodukujaluladiludu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1481/4882/files/69762318276.pdf
    • https://cdn.shopify.com/s/files/1/0437/6448/2202/files/engineering_company_profile_examples.pdf
    • https://cdn.shopify.com/s/files/1/0428/3550/9415/files/80621109921.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/11085861466.pdf
    • https://cdn.shopify.com/s/files/1/0433/8581/5205/files/greensleeves_sheet_music_piano_beginners.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_off000078d0.bin
2ff7c4de85af8b7d94aa2448f5bfa112181f4bc38c5ed5468a82889936c1b50c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78D0 5396 bytes
font_01_sfnt_off00008b1a.bin
6517a5051d2873153f02c71323ab360a5db8a41d82a1baae2280fbedb50b7a25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B1A 14996 bytes

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