PDF malware analysis — malicious · d9551fc4e2770ab2

MALICIOUS

PDF

43.2 KB Created: 2020-08-29 02:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: c8d18d04196c0b8af2bef7a5c662bb78 SHA-1: b8ef42a207926974d9e05c8f86195d1dcb15388e SHA-256: d9551fc4e2770ab206ba0c6bb5eb70b7b830adb9a80e2ebed8d7d7806dcf5986

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by an ML classifier and contains a high number of embedded links. One of these links, https://ttraff.ru/wix?keyword=icd+10+code+for+chronic+hepatitis+b, points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL and other links, suggesting a link farm or SEO spam attack pattern. The primary intent appears to be directing users to potentially harmful external content.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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.
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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=icd+10+code+for+chronic+hepatitis+b
- https://static.usrfiles.com/ugd/b8c837_446338321e9c404c8df91cf8cb58e0c2.pdf
- https://static.usrfiles.com/ugd/b8c837_6ceb8b81ccd44384867f06605ed506c9.pdf
- https://static.usrfiles.com/ugd/b8c837_2e3272093a2246d1b0fe2b1954061fba.pdf
- https://static.usrfiles.com/ugd/b8c837_0792b88f3e704728b07e4b0b60683034.pdf
- https://static.usrfiles.com/ugd/b8c837_7d76c244ae7947faaaadb2c0fb6b1ba1.pdf
- https://cdn.shopify.com/s/files/1/0435/0276/4192/files/xopunizarenixa.pdf
- https://cdn.shopify.com/s/files/1/0433/9384/3358/files/kenum.pdf
- https://cdn.shopify.com/s/files/1/0438/7622/1096/files/islami_bachon_ke_naam_urdu.pdf
- https://cdn.shopify.com/s/files/1/0460/2150/9279/files/85651203480.pdf
- https://cdn.shopify.com/s/files/1/0431/6486/0575/files/vedefovaxewaje.pdf
- https://static.usrfiles.com/ugd/b8c837_a7c66bdfd47e45849508a83533fc6e57.pdf
- https://static.usrfiles.com/ugd/b8c837_f7899db766d849b7911342b2a34b52c2.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_off00006be8.bin` `6329b17b3ad3f66fdbb051e97d59d67cd9a2724c0c36ae55cbf15de973412c6f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6BE8	5480 bytes
`font_01_sfnt_off00007e70.bin` `65535361e363bd9c27163691dbbbe6f59470de5e303ce1bf8967c72389be3db2`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7E70	9772 bytes

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