PDF malware analysis — malicious · bf893abea8e6522e

MALICIOUS

PDF

50.3 KB Created: 2020-09-01 14:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: babcce1cf45ca3992057c54f3a014fe4 SHA-1: 1e460d89561695e6000f482431f27c0c439af9d0 SHA-256: bf893abea8e6522e84692f57f37bf05505aff4dbe87edcf4143e1d6888e06502

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/wix?keyword=fiction+vs.+nonfiction+worksheet+1st+grade'. The ML classifier also strongly indicated maliciousness. The document body text is heavily obfuscated but contains the same suspicious URL.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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/wix?keyword=fiction+vs.+nonfiction+worksheet+1st+grade
- https://cdn.shopify.com/s/files/1/0438/0576/9888/files/geforce_other_installations_are_running.pdf
- https://cdn.shopify.com/s/files/1/0428/6545/9366/files/18210005737.pdf
- https://cdn.shopify.com/s/files/1/0435/6043/5871/files/towukesilamuvonebulutajan.pdf
- https://cdn.shopify.com/s/files/1/0431/9117/3278/files/1481624782.pdf
- https://cdn.shopify.com/s/files/1/0428/5969/2191/files/ielts_general_writing_task_1_sample_answer_band_9.pdf
- https://cdn.shopify.com/s/files/1/0428/7679/7081/files/silomobopasupe.pdf
- https://static.usrfiles.com/ugd/111c46_8c07f7834a0842729c9c86cb186a6aa4.pdf
- https://static.usrfiles.com/ugd/b8c837_6068b535c0434f75b77597b0c4d02e5b.pdf
- https://cdn.shopify.com/s/files/1/0434/0465/6790/files/44903193379.pdf
- https://cdn.shopify.com/s/files/1/0431/2072/2080/files/70827165020.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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000056c5.bin` `3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x56C5	6440 bytes
`font_01_sfnt_off000066b9.bin` `753df44b128d87c200a6d568be8732ed095f8607dd6d72e7bbd84ac489517371`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x66B9	5504 bytes
`font_02_sfnt_off00007994.bin` `daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7994	1800 bytes
`font_03_sfnt_off00008222.bin` `de7b8cef758c85d859740e501a86254f209b79cc90253ecfc61322fc1945a65f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8222	10700 bytes
`font_04_sfnt_off0000a6e8.bin` `52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA6E8	16036 bytes

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