Malicious PDF — malware analysis report

Static analysis result for SHA-256 b579cc69df547cdc…

MALICIOUS

PDF

41.5 KB Created: 2020-08-10 05:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f77b7181a1e638352015de7f19d2170 SHA-1: 7e0a75afbcf1a8e65161cd97c78470a873d20995 SHA-256: b579cc69df547cdcb7605fde9a012e5c7c186c4f640d91d51a580622b58f6626
120 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=brain+teaser+riddles+pdf', suggesting a lure to trick users into visiting malicious sites under the guise of 'brain teaser riddles'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the presence of links to malicious infrastructure.

Heuristics 3

  • 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.
  • 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=brain+teaser+riddles+pdf
    • http://files.cyberpost.us/uploads/1/3/0/7/130739835/felijopi_fexukikigobok_fepirebepa.pdf
    • http://files.mstbaldwin.com/uploads/1/3/0/8/130813301/525b793142.pdf
    • http://files.marlousdesigns.com/uploads/1/3/0/8/130814021/b278ff391af6.pdf
    • https://cdn.shopify.com/s/files/1/0429/6228/8793/files/duzeze.pdf
    • https://cdn.shopify.com/s/files/1/0430/1851/8681/files/xalasesavisutukebegowaxox.pdf
    • https://cdn.shopify.com/s/files/1/0431/1446/3394/files/35929607011.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/35209966956.pdf
    • https://cdn.shopify.com/s/files/1/0435/8383/2227/files/202_870_5858.pdf
    • https://cdn.shopify.com/s/files/1/0440/1142/1854/files/agricultural_economics_agrimoon.pdf
    • https://cdn.shopify.com/s/files/1/0435/2914/2426/files/partido_liberal_mexicano.pdf
    • https://cdn.shopify.com/s/files/1/0428/4288/2215/files/minecraft_survival_games_servers.pdf
    • https://cdn.shopify.com/s/files/1/0429/1903/5033/files/bemutenixavenuti.pdf
    • https://cdn.shopify.com/s/files/1/0440/1928/6174/files/1902135759.pdf
    • https://cdn.shopify.com/s/files/1/0435/1338/1028/files/janusediz.pdf
    • https://cdn.shopify.com/s/files/1/0437/4845/8647/files/dantdm_voice_changer.pdf
    • https://cdn.shopify.com/s/files/1/0431/7796/7778/files/sigizaris.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_off0000658f.bin
2b8ca01caeeafeb9dd252e12494fe4b08e91edb80e9ce785aa1e50a558e2b389		 pdf-font-stream PDF embedded font (sfnt) at offset 0x658F 5084 bytes
font_01_sfnt_off000076eb.bin
1ed6f242e413c04ae0bfef6962b23142ea8da8670b33d91a0265bec22788d4fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76EB 10024 bytes

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