Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb5042c7b91ec470…

MALICIOUS

PDF

41.8 KB Created: 2020-09-07 09:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 006f543e6c4c6153052c26f15b98b961 SHA-1: 3ca0e1b3c253f5168e6a538a0afff9edb880b979 SHA-256: eb5042c7b91ec470541da99cd4186083e29e942b20c0c62ae4fc98faf7de7daf
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as AWS certification exam information. This link points to a URL that is known to host malicious content. The document also features a large number of external PDF links, many hosted on Shopify, which is indicative of a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.link/pify?keyword=aws+certification+exam+guide
    • https://cdn.shopify.com/s/files/1/0440/0319/7078/files/53471337374.pdf
    • https://cdn.shopify.com/s/files/1/0433/8886/2622/files/2017_honda_pilot_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/2181/1364/files/89656425452.pdf
    • https://static.usrfiles.com/ugd/1e8759_36ac1bb2c7dd4480954b404123d0a312.pdf
    • https://static.usrfiles.com/ugd/b9801a_d2a3201c7c8f426fb30a0c421b0bca8f.pdf
    • https://static.usrfiles.com/ugd/b8c837_35eddabeec164694aa16ed90af27fc0c.pdf
    • https://static.usrfiles.com/ugd/921909_02050529e69945bc9d810bc398575da9.pdf
    • https://static.usrfiles.com/ugd/df4650_58d72c8f9712460ea15667fcd7d3988f.pdf
    • https://cdn.shopify.com/s/files/1/0436/6611/2662/files/70749492412.pdf
    • https://cdn.shopify.com/s/files/1/0434/5525/0598/files/24795175150.pdf
    • https://cdn.shopify.com/s/files/1/0433/9056/6556/files/38668678679.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/53147487516.pdf
    • https://cdn.shopify.com/s/files/1/0438/3290/1789/files/tcs_maths_aptitude_questions.pdf
    • https://static.usrfiles.com/ugd/ce0e6d_2fde71809d63434eba49da29be392bd2.pdf
    • https://static.usrfiles.com/ugd/113e89_5b6533e7f88d4e6fbdebfa9c319d06ab.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_a1442d0b30a64088b764e877dc556318.pdf
    • https://static.usrfiles.com/ugd/ea9bdf_1e97503ea548432db42b51494e55713f.pdf
    • https://static.usrfiles.com/ugd/3835dd_ecf8a9f78d264869956e4042a07eda54.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_off000066a3.bin
53cd1e68a37b7f714c9494ed22da0d2729001c8300f917a8fb9f47c85d9cbb96
pdf-font-stream PDF embedded font (sfnt) at offset 0x66A3 5460 bytes
font_01_sfnt_off00007933.bin
74a6e0a4e1792ecc64444d596108840396938e3dae25dfb692aad058dcca916b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7933 9764 bytes