PDF malware analysis — malicious · 14239c018330332f

MALICIOUS

PDF

39.2 KB Created: 2020-08-31 18:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 5c58cd019fdfd9da520b3420ff920539 SHA-1: b83ea22c86be7c37b0455a02762f5f8622791bf0 SHA-256: 14239c018330332f22f342b611ca75b70acbdab8aa5831303ea1694961545d27

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a link disguised as an admission form, which redirects to a known malicious infrastructure. The ML classifier strongly indicated maliciousness, and the presence of numerous external PDF links suggests a link farm or redirection scheme. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive document.

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/pify?keyword=bzu+admission+form+ba+2019
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/b8c837_05993c81144f4aa2b98467f1fba49b0c.pdf
- https://static.usrfiles.com/ugd/22bf55_aab172f59b534429905a4d57b5f6d348.pdf
- https://static.usrfiles.com/ugd/5bb01c_ab5748d7f653457c9d92e53d896eb18d.pdf
- https://static.usrfiles.com/ugd/b88e3d_3424824d0e2e42d68469f1b1cb8c87e8.pdf
- https://cdn.shopify.com/s/files/1/0427/4513/5260/files/linek.pdf
- https://cdn.shopify.com/s/files/1/0432/8433/2710/files/tratamiento_glioblastoma_multiforme.pdf
- https://cdn.shopify.com/s/files/1/0428/4763/3575/files/angrau_bsc_agriculture_notes.pdf
- https://static.usrfiles.com/ugd/b8c837_2e11ff3e91fc41cd85f632d0b3ccf2ae.pdf
- https://static.usrfiles.com/ugd/af0aa9_a808468c30814cc69d62931ab2a9cd4b.pdf
- https://static.usrfiles.com/ugd/1f2646_21cc4e36be4b459aa3840c0169f418bc.pdf
- https://static.usrfiles.com/ugd/b8c837_a2a807880bc94fa796a6c93447feb93f.pdf
- https://static.usrfiles.com/ugd/2e4eb4_93e2bb6e4dcb4e94a5bf0c0c039b44e4.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_off00005b43.bin` `4f992793f66e80be1af3a3d4458c985ae7e355e88a3ae678b76eb183adfb68ad`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5B43	5744 bytes
`font_01_sfnt_off00006ec1.bin` `ef66a98cc6d26cea2106f6d9fe82b4ee0b5b15af9ffa937900ab1e7a1d5e5a2b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6EC1	9848 bytes

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