PDF malware analysis — malicious · 2b360650c7edbfa1

MALICIOUS

PDF

41.2 KB Created: 2020-09-01 00:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: baba99e0476b9509389cad560b49907a SHA-1: a578552da77d11c851bd47572e3376a9d2e049f1 SHA-256: 2b360650c7edbfa1a99c7ed08fe38c286d13531afa57d34e681cb9fb412ecc31

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external links, indicating a link farm. The primary malicious URL identified is https://ttraff.cc/wix?keyword=aphasia+therapy+workbook+pdf, which is likely used to redirect users to a malicious site. The document body, though heavily obfuscated, also contains this URL, reinforcing its role in the attack. The ML classifier also strongly indicated 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.cc/wix?keyword=aphasia+therapy+workbook+pdf
- https://static.usrfiles.com/ugd/73cb9e_6d94b64baf804c3db52b5e3e4a7e03e8.pdf
- https://static.usrfiles.com/ugd/ca300b_b3e46623fe5c435d86a78748062b0a87.pdf
- https://static.usrfiles.com/ugd/b8c837_910e7a75e1584e87aaf707987ae68d13.pdf
- https://static.usrfiles.com/ugd/1f2646_40dddf4c101841c18a57388ca121e47b.pdf
- https://static.usrfiles.com/ugd/3ceeb9_9fa58e3bfa5f45a38e6bd3c60695e948.pdf
- https://static.usrfiles.com/ugd/55cc32_c036902834754e01b9cb6ef611e62d38.pdf
- https://static.usrfiles.com/ugd/affb4a_4e6bf31b67c14fc8af1d0ab4b07ee5eb.pdf
- https://static.usrfiles.com/ugd/097bd5_4a5ca672f4e54de88d602ad578db01ce.pdf
- https://static.usrfiles.com/ugd/d9d1f5_aeeee936379344ecbf336c4b93be5d6f.pdf
- https://cdn.shopify.com/s/files/1/0435/6685/8408/files/58364654140.pdf
- https://cdn.shopify.com/s/files/1/0430/7891/0106/files/49298471414.pdf
- https://cdn.shopify.com/s/files/1/0434/9100/0472/files/mcgraw_hill_connect_answers.pdf
- https://cdn.shopify.com/s/files/1/0433/7421/5331/files/91817781665.pdf
- https://cdn.shopify.com/s/files/1/0431/1387/3569/files/lakigasubagozir.pdf
- https://static.usrfiles.com/ugd/4e6dd5_ba5ea603de234b64b22abfc9fd3314ca.pdf
- https://static.usrfiles.com/ugd/a1fb72_315915015fc54fae920be10dc60461b4.pdf
- https://static.usrfiles.com/ugd/5de1df_665d6e85fe4d4cd68e899ad955af2c28.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_off0000636c.bin` `e604f675f9fb23d72683c112d343bf20b13fa30903fc290afb2c7c600335739d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x636C	5484 bytes
`font_01_sfnt_off0000761d.bin` `a68bf5738ad051fbd5750314d50b7ecd71d22e60b89e4e7f10c4c6a68916793b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x761D	9928 bytes

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