PDF malware analysis — malicious · ac4fdd801c523cc5

MALICIOUS

PDF

33.5 KB Created: 2020-09-11 02:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: cb4553621c944c73dc0b15ab51e70146 SHA-1: d34349effcf968ab79bd78e07b8e549f4d291250 SHA-256: ac4fdd801c523cc5824fe068be6d20ff6e0014ffd58573534ecef430486973d1

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 critical link to a known malicious redirector at ttraff.me. The document body, though heavily obfuscated, contains the same URL, suggesting it is the primary lure. The ML classifier strongly indicated maliciousness. The presence of numerous links to static.usrfiles.com suggests a link farm used for SEO poisoning to drive traffic to the malicious redirector.

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.me/wix?keyword=alaipayuthey+film+songs++in+masstamilan
- https://static.usrfiles.com/ugd/b8c837_45d127f7681548068b15fb56c7872518.pdf
- https://static.usrfiles.com/ugd/96a426_fe50a30484664cb69c5a9f988f92b51f.pdf
- https://static.usrfiles.com/ugd/ced2dc_b1e187ad2c9e457085db58b9c664d398.pdf
- https://static.usrfiles.com/ugd/ab0441_68ab4016f0834e498b2c4aa5d883e80e.pdf
- https://static.usrfiles.com/ugd/bae363_ff73b886139e4c01a334d59e2620a73a.pdf
- https://static.usrfiles.com/ugd/4d935e_acc479410e54428fb0957804bcce39d4.pdf
- https://static.usrfiles.com/ugd/79e5df_fa3a1aa7e0324a76abe85997782e5df7.pdf
- https://static.usrfiles.com/ugd/d2b720_1e0c699eabc84c98975251d2da10cc4a.pdf
- https://static.usrfiles.com/ugd/909b15_71ab419967ce4a2fb34fe3abe4b93fc2.pdf
- https://static.usrfiles.com/ugd/b8c837_eea862f89f4e476b905f8d61a6bb3ff7.pdf
- https://static.usrfiles.com/ugd/9f06f8_e4bda12b52504c338497114b367b9557.pdf
- https://static.usrfiles.com/ugd/b8c837_6aecdae74ae14960af658b92618a68f8.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_off00004675.bin` `6ef8406d363ba5f508c677b608da7c395e5fb26787aeed56e6b6fbb711674988`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4675	5308 bytes
`font_01_sfnt_off00005871.bin` `0e602797412bcfe160555fe8231f5c6aaae63b477c2e86eae19d70ca8c619137`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5871	9764 bytes

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