PDF malware analysis — malicious · cd8d9d4fefe15b0f

MALICIOUS

PDF

46.1 KB Created: 2020-08-30 01:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 1282d5c2b2953c52d9a2591194beb670 SHA-1: fce6b5175eedf3d556ca4e5e99c2b1c402c8a724 SHA-256: cd8d9d4fefe15b0f0af87e4e44c0ebd4278d04e2a2c0de185bdb81aee967757b

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass of external links, including a redirector to a malicious domain, disguised as a loan form download. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to 'sbi loan form download pdf' and the malicious URL, reinforcing the lure. No scripts were extracted, but the PDF structure itself is used for malicious redirection.

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.com/wix?keyword=sbi+loan+form+download+pdf
- https://static.usrfiles.com/ugd/b8c837_25286c4c53824c33bd323f6e63ff0e53.pdf
- https://static.usrfiles.com/ugd/067ecb_c21c231fa4c34768a255f432e13a78c7.pdf
- https://static.usrfiles.com/ugd/913720_91436707fd4c407c80ee9507ca663f8b.pdf
- https://static.usrfiles.com/ugd/1d64af_dad5d4315eed47a9851e92206278d21c.pdf
- https://cdn.shopify.com/s/files/1/0435/1125/1099/files/55518862548.pdf
- https://cdn.shopify.com/s/files/1/0440/6303/1448/files/jazazomunojat.pdf
- https://cdn.shopify.com/s/files/1/0428/1604/5222/files/xufotafaxesejurozuwopim.pdf
- https://cdn.shopify.com/s/files/1/0434/1350/4150/files/sazuvofasopumag.pdf
- https://cdn.shopify.com/s/files/1/0436/3157/5198/files/72490893365.pdf
- https://cdn.shopify.com/s/files/1/0437/6517/0334/files/54835775182.pdf
- https://cdn.shopify.com/s/files/1/0431/6063/3504/files/jimanibuwixow.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_off000060b8.bin` `76e9e439023af465395006a832f5985a84c063a214dc4bf7ab732d633055dc36`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x60B8	5344 bytes
`font_01_sfnt_off000072d7.bin` `272cb110991ca89e4d53620011756dbb69c15d8444f54a31ff6ae1fe9a98ae70`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x72D7	10548 bytes
`font_02_sfnt_off0000969d.bin` `9e1271d681207e96fe60c94df920a27091a957dc81e2614e9e6235263a34fce6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x969D	16068 bytes

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