PDF malware analysis — malicious · 4b9e876f7f235546

MALICIOUS

PDF

45.0 KB Created: 2020-08-31 21:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 998dc7800e2dc0ff47678b093ac364ad SHA-1: 5dd0f79d6afab202929e6dbcc757cbb87548af56 SHA-256: 4b9e876f7f2355464c98c161b7ea7eb68fcc1ecacfe8b6beeed06665bd0a375f

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wix?keyword=geometry+worksheets+2nd+grade+pdf', suggesting a lure to disguise malicious activity. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves redirecting the user to malicious infrastructure.

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.cc/wix?keyword=geometry+worksheets+2nd+grade+pdf
- https://static.usrfiles.com/ugd/36f25b_88c1b2bac7fb48928b8bd7c6d5f4e011.pdf
- https://static.usrfiles.com/ugd/df4650_0a3912c6204645f18318d6493f72cb05.pdf
- https://static.usrfiles.com/ugd/b8c837_c692caf4a0a64d8ca1ba09c60602eacc.pdf
- https://static.usrfiles.com/ugd/b8c837_7de91ee6400e4ae6a6f20299d784fb41.pdf
- https://static.usrfiles.com/ugd/3dd68e_527bf1e6ec384fefbbc477d26e3fd43d.pdf
- https://static.usrfiles.com/ugd/913720_5be37b63ff6e4d0ba734ab09369e3eb2.pdf
- https://static.usrfiles.com/ugd/b8c837_16b52d1e7e444b0396e282047c1fca6e.pdf
- https://static.usrfiles.com/ugd/8b9728_6a62a91dcc5241abb8a7d9646f60f04e.pdf
- https://static.usrfiles.com/ugd/b910ae_c832ac33bee848afaadfbb582d0c04af.pdf
- https://cdn.shopify.com/s/files/1/0434/0560/7079/files/gunojivugabuxega.pdf
- https://cdn.shopify.com/s/files/1/0438/7930/1275/files/tezadibefigatomu.pdf
- https://cdn.shopify.com/s/files/1/0427/9749/8535/files/arcus_foundation_annual_report.pdf
- https://cdn.shopify.com/s/files/1/0430/7173/3917/files/13580490458.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_off00006185.bin` `294f40a8c2f3473fab6008c33449028932b1fd0dafa5687b46212dfd0bc35d56`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6185	5844 bytes
`font_01_sfnt_off00007558.bin` `7a02da73c5ff24218d04b188db7d31ceb9303d5dedd43b645f18a615a19d9b6a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7558	6068 bytes
`font_02_sfnt_off00008508.bin` `1c927ec81be25ca5af599d9f455401f23b65131c6a9a164de63dd555568637eb`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8508	9960 bytes

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