PDF malware analysis — malicious · 4d373e6156b226be

MALICIOUS

PDF

43.3 KB Created: 2020-08-30 17:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 111af74393f89c10916007102500b9f7 SHA-1: 374f959293e3d5be0d31a76ab5ccafbed7470ae7 SHA-256: 4d373e6156b226be007c36aa8d126b4db2d94a622560bb131be6ad249065dc99

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as a stoichiometry worksheet. This suggests a phishing or scam attempt to redirect users to malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, limiting the analysis of further execution chains.

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=mole+to+mole+stoichiometry+worksheet
- https://static.usrfiles.com/ugd/b47706_b4ee125508794e35ac61548a9bfbe7ed.pdf
- https://static.usrfiles.com/ugd/c1de29_cfb35b4ae63546aca516a777bee5670a.pdf
- https://static.usrfiles.com/ugd/b8c837_b1eb81697ff347718ec98a3c8ebf3ed8.pdf
- https://static.usrfiles.com/ugd/b8c837_dca248b2fdd34075aa563d43fe792528.pdf
- https://static.usrfiles.com/ugd/b8c837_6ed78aad2bad426683c752065a27b131.pdf
- https://cdn.shopify.com/s/files/1/0431/9969/2958/files/banev.pdf
- https://cdn.shopify.com/s/files/1/0434/1684/6488/files/exercise_simple_present_tense_with_answer.pdf
- https://cdn.shopify.com/s/files/1/0431/4945/9605/files/12716069921.pdf
- https://static.usrfiles.com/ugd/f84671_78014bfbdf8542f19604600e11b03bd8.pdf
- https://static.usrfiles.com/ugd/b8c837_c984c48df95d4e6a9a68e1b456226d62.pdf
- https://static.usrfiles.com/ugd/b8c837_3f66f03741b147d385a27749e24f2d19.pdf
- https://static.usrfiles.com/ugd/accd1f_497bb654774843a0802fe99a9bdcf95e.pdf
- https://static.usrfiles.com/ugd/704566_7abb869921a84ef787963104ff2a86e8.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_off000069ff.bin` `cf09ef60dcaf6ae3af710029c1ed6ce501e688a838b4125aa9431e317cc9a9c3`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x69FF	5092 bytes
`font_01_sfnt_off00007b4c.bin` `be1561701177cfeb6b7c21d5acf234246222935657de2b2b757217a4450a0ee2`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7B4C	10344 bytes

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