Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b838389c94a1009…

MALICIOUS

PDF

58.7 KB Created: 2020-08-07 18:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57d9d8e2267d2ce57398999c95794672 SHA-1: e1d904dfc1f4b1a05839f5cc40a0954751a1ad2e SHA-256: 4b838389c94a100986aa9ffe78367f92e069402f05bb43f662f02faa85c5e00f
120 Risk Score

Malware Insights

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

The PDF file contains numerous links to external resources, with a critical heuristic firing indicating it's a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=similarity+and+congruence+worksheet+pdf', which is also flagged as a malicious redirector. This suggests the primary purpose is to redirect the user to a malicious site, likely for phishing or further malware delivery.

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=similarity+and+congruence+worksheet+pdf
    • http://files.gloryinfocus.com/uploads/1/3/2/3/132302999/9157620.pdf
    • http://files.psychsisters.com/uploads/1/3/1/8/131858044/wilut.pdf
    • http://files.sunburylionsclubofohio.org/uploads/1/3/0/7/130739731/nuzilerorage.pdf
    • http://files.ncam.ac.nz/uploads/1/3/0/7/130776788/a94fe6a1c2f25a.pdf
    • http://files.flatlanderclimbing.com/uploads/1/3/0/7/130776158/mibokarekasama.pdf
    • https://cdn.shopify.com/s/files/1/0432/2230/2888/files/rusejogawazotabatawesada.pdf
    • https://cdn.shopify.com/s/files/1/0433/8722/4214/files/pojimubov.pdf
    • https://cdn.shopify.com/s/files/1/0431/9815/2866/files/biogenesis_of_ribosome.pdf
    • https://cdn.shopify.com/s/files/1/0430/4021/1105/files/31299017076.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5485/files/51750498305.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/zelizu.pdf
    • https://cdn.shopify.com/s/files/1/0439/9860/9566/files/81093058438.pdf
    • https://cdn.shopify.com/s/files/1/0437/9534/9666/files/28576903239.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/luvojovolejowilavikoz.pdf
    • https://cdn.shopify.com/s/files/1/0427/4293/9814/files/anche_in_italiano.pdf
    • https://cdn.shopify.com/s/files/1/0432/0506/6913/files/lemexalulubepomibo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0776/1819/files/38111556352.pdf
    • https://cdn.shopify.com/s/files/1/0439/4464/0667/files/quickbooks_payroll_manual.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/
    • https://cdn.shopify.com/s/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000083b3.bin
e7cc228835d8d6f1d18d5f01a5f3aea68885b97213673735805854dd7d2297f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83B3 5812 bytes
font_01_sfnt_off00009757.bin
1ad8ce456b7ec41ab85735506b98b7d267e6ff2711646e504b3ee35c41359d6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9757 10052 bytes
font_02_sfnt_off0000b9c3.bin
24c5c481937acf4f4841e6563a6d7a18cfdb810806c94b09ac0ff4033348c1e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C3 16072 bytes
font_03_sfnt_off0000ce62.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE62 4324 bytes

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