PDF malware analysis — malicious · a633eed7e7cfa19b

MALICIOUS

PDF

40.5 KB Created: 2020-09-07 19:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 0240e7af458d291ad202f81342431941 SHA-1: 4e6ed83df4091fd6fc1b738d04e934ab01c298a2 SHA-256: a633eed7e7cfa19b6c4a410135fa5bdf644705e5f124f9af7be4074c7becc837

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.link/wix?keyword=worksheet+on+converting+fractions+to+decimals+pdf', is designed to redirect users to malicious infrastructure. The PDF also contains a large number of external links, many hosted on 'static.usrfiles.com', which is flagged as a link farm. The ML classifier strongly indicates maliciousness.

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/wix?keyword=worksheet+on+converting+fractions+to+decimals+pdf
- https://static.usrfiles.com/ugd/c8d394_09ebbe767987420b9a861a2795882fc7.pdf
- https://static.usrfiles.com/ugd/e49726_e513054f7b9241bc91f3656fa0742527.pdf
- https://static.usrfiles.com/ugd/6260fe_fb088af6bad84f9799a1a13d75ebc44f.pdf
- https://static.usrfiles.com/ugd/17beed_e87c4eac905f4326b84d8f7e9f27fe68.pdf
- https://static.usrfiles.com/ugd/87b9a8_25ff90c812b546b8b5dafa699994ae12.pdf
- https://static.usrfiles.com/ugd/b8c837_e24d915b7adb4a728f09d69b917fe139.pdf
- https://static.usrfiles.com/ugd/b8c837_c112fd4767cd431aad59b708858221f5.pdf
- https://static.usrfiles.com/ugd/8ff694_73d8430728204af2805036752dfaacf3.pdf
- https://static.usrfiles.com/ugd/99b222_da7e048bb42a49c8a00ccf3696638717.pdf
- https://static.usrfiles.com/ugd/3d514e_b4872b425be74e97b233837995ea5580.pdf
- https://static.usrfiles.com/ugd/ee6770_39f33bc7a015489886c8d91642ee96c3.pdf
- https://static.usrfiles.com/ugd/e3834b_fed6a1d71abb417496c39062dc9d8e79.pdf
- https://static.usrfiles.com/ugd/df73ab_522662eabaa449bc9fd36675993f799d.pdf
- https://static.usrfiles.com/ugd/b98abb_2ed4922d933249d58e008b7b515df74a.pdf
- https://static.usrfiles.com/ugd/2f3ac6_7678053ecd4d424b89bff5d53342ac5e.pdf
- https://static.usrfiles.com/ugd/83f04e_c6265df45c864e66bbc3bb7ea284a87c.pdf
- https://static.usrfiles.com/ugd/4f270c_48482ee50a8b4556bff191274938ebf7.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.

Filename	Kind	Source	Size
`font_00_sfnt_off00005ee4.bin` `e620677684af3ff6f079b531991d5965d8293e37a93a2872525fcf2274b720f5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5EE4	5704 bytes
`font_01_sfnt_off00007242.bin` `eb811bd376b91ced5bdd252a1a441e85b77175922e502dfacc1ab1d48865356c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7242	10212 bytes

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