PDF malware analysis — malicious · b1d4cfbc50ee9080

MALICIOUS

PDF

41.8 KB Created: 2020-09-06 19:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: f1a7c349de73b7ade4dcbc7b503ca844 SHA-1: 7e58f5b2df401aa227850e94ff428274242a4774 SHA-256: b1d4cfbc50ee90804c19e412cb7ca9b87431e547421ef955c286f505ed04601c

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.me, which is disguised as a 'Nobel biocare impression coping guide'. The document also features a large number of links to external PDFs hosted on static.usrfiles.com, suggesting a link farm for SEO manipulation or to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

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=nobel+biocare+impression+coping+guide
- https://static.usrfiles.com/ugd/b910ae_10d4426de7604879b67bafec988822c8.pdf
- https://static.usrfiles.com/ugd/fa32a6_ca9b7b69af8f46a385b4a6e067fb2b1b.pdf
- https://static.usrfiles.com/ugd/bb4607_e171e1191cd74783aa24864ba8647de6.pdf
- https://static.usrfiles.com/ugd/824332_93504c4db23a46b1ad80fe8d4fe7d906.pdf
- https://static.usrfiles.com/ugd/455f95_1275bbded8b0428b8e0d68c0c610058a.pdf
- https://cdn.shopify.com/s/files/1/0429/9754/7157/files/github_read_me.pdf
- https://static.usrfiles.com/ugd/b8c837_ad64b139ef814e4697fa16b5cca6eaac.pdf
- https://static.usrfiles.com/ugd/9d66c7_c0abf2f130394050a366678dca43f4c4.pdf
- https://static.usrfiles.com/ugd/1813b3_dc9c3f09e6c044a49765cc3c6dfc4ccf.pdf
- https://static.usrfiles.com/ugd/837d34_b28ccdd8a8e34d07ab7b0254afd14670.pdf
- https://static.usrfiles.com/ugd/50c35f_632bb1539e7041868d3eb2b6232b58a8.pdf
- https://static.usrfiles.com/ugd/ecec20_73fbbb01cf704613a7647389ec7f9f68.pdf
- https://static.usrfiles.com/ugd/9421c8_7721415cf83246088aac29fb56e89d48.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_off000066ea.bin` `37dc861c710b66f5eaa245b35627a1b91bc65b069b062f504ec1026a26965163`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x66EA	5504 bytes
`font_01_sfnt_off00007983.bin` `0f85942214e2e24b42baf06a753050f1817a777c2b9ee60691f9d87a5c66c287`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7983	9468 bytes

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