PDF malware analysis — malicious · e616ef6f1d56126a

MALICIOUS

PDF

45.5 KB Created: 2020-09-05 17:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: fe9dcde0d6f65df4dcc7c6d0e70674f2 SHA-1: 5bc9c4abb9fb8bb373e466485bef5bfed53d1469 SHA-256: e616ef6f1d56126a38efbb283ee4535fb8acdde4d8ff9a7e09a2d251159b4219

120 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, pointing to a URL that is disguised as a worksheet answer key. The document body and embedded URLs reinforce this lure. The primary malicious URL is https://ttraff.club/wix?keyword=introductory+chemistry+worksheet+answers, which likely leads to a further malicious resource. The PDF also contains a large number of embedded links, many pointing to static.usrfiles.com, which is flagged as a link farm.

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.club/wix?keyword=introductory+chemistry+worksheet+answers
- https://static.usrfiles.com/ugd/df73ab_acf7591503fb404d8f0d04e88734839f.pdf
- https://static.usrfiles.com/ugd/4aae87_5541ce4feb7e492e934c3952683ab77d.pdf
- https://static.usrfiles.com/ugd/89064d_8c8297a34ccf49ae9636a1bd9db22f51.pdf
- https://static.usrfiles.com/ugd/3826db_34883ff073e14c8cbbfce0a8c47844be.pdf
- https://static.usrfiles.com/ugd/4c1554_756f509e5de9463ea7ed53d3764ec9e6.pdf
- https://static.usrfiles.com/ugd/205ae4_98501924a8f4405a86983cfa3ad0cac2.pdf
- https://cdn.shopify.com/s/files/1/0428/8937/9993/files/alhagi_maurorum.pdf
- https://cdn.shopify.com/s/files/1/0433/0913/8084/files/98468132202.pdf
- https://cdn.shopify.com/s/files/1/0459/2520/4117/files/98979292004.pdf
- https://cdn.shopify.com/s/files/1/0430/5226/9717/files/nopisuzosemamazu.pdf
- https://static.usrfiles.com/ugd/1decf9_c5beaceeb1ff4eacb615f80eb9328fea.pdf
- https://static.usrfiles.com/ugd/270e53_dd538925e55d407d92109ff7a18593ee.pdf
- https://static.usrfiles.com/ugd/d43733_9c1f9e4f11e0469cbdd0011695dff911.pdf
- https://static.usrfiles.com/ugd/d94ae5_305f8f285d3e4008bcc7e01c7c3bd0df.pdf
- https://static.usrfiles.com/ugd/b8c837_6fab0fb2f8284ee8a177317f2dddbf43.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00006434.bin` `9fc095601eb0a950d6b9343630beab6a8e6f4895b7423363e4d2d6a655bc0f75`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6434	5224 bytes
`font_01_sfnt_off000075d7.bin` `25f868516e50efbcb4e611f74b5fe2b50daae1da3b286ce62db258cd581201a6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x75D7	10832 bytes
`font_02_sfnt_off00009ae2.bin` `ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9AE2	4324 bytes

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