PDF malware analysis — malicious · 65554f77a0134bb0

MALICIOUS

PDF

49.4 KB Created: 2020-09-06 08:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: a7f4bb2e4578938ce90d5e7a14afb418 SHA-1: 395f3ea70fa402792c74d324a1536b7c675c5ca3 SHA-256: 65554f77a0134bb02b2f5e69dfc1a8d00f2cf29cdd39c6c836a6cff71ed09838

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to a link farm. One of the primary links, 'https://ttraff.me/wix?keyword=candidate+assessment+form+meaning', is identified as a malicious redirector. This suggests an attempt to direct users to malicious infrastructure, likely for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

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=candidate+assessment+form+meaning
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/cfa91a_525eeffa4eb54635ba30609ef5869d10.pdf
- https://static.usrfiles.com/ugd/628a76_78fb9af5e0934fbfb9d39b2a01df6999.pdf
- https://static.usrfiles.com/ugd/4542d9_88cbb23c57c3480381248fa58189b92f.pdf
- https://static.usrfiles.com/ugd/ac51ce_2819c458fcdb4da8a65c0bca2405e4bd.pdf
- https://static.usrfiles.com/ugd/bbd3cf_ce05c3005bc942bcb32a9d86cf20b1a5.pdf
- https://cdn.shopify.com/s/files/1/0433/1533/1227/files/macroeconomia_michael_parkin_9_edicion.pdf
- https://cdn.shopify.com/s/files/1/0434/1923/8562/files/parimisiboxowe.pdf
- https://cdn.shopify.com/s/files/1/0430/5341/6601/files/96722703103.pdf
- https://cdn.shopify.com/s/files/1/0435/4742/6965/files/27538090930.pdf
- https://cdn.shopify.com/s/files/1/0432/6398/3769/files/nfl_concussion_protocol.pdf
- https://cdn.shopify.com/s/files/1/0430/4008/0025/files/nzta_manawatu_gorge_report.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/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000078da.bin` `6792c696e9e001bcfa1c5366cf767830427e09a715b67c2882e0cd6be647adbe`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x78DA	5100 bytes
`font_01_sfnt_off00008a1b.bin` `c10c423678cc2a58a425605a5dc30e4fd00a96568a4b04e5b52c9a97a2cde4e6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8A1B	14988 bytes

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