PDF malware analysis — malicious · 8789dbcafb365400

MALICIOUS

PDF

39.7 KB Created: 2020-08-30 08:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 21ce44aaeecb29362d71c0d5940f8aa8 SHA-1: b4ae4d8380ab0773beed9a1584fae9e2592d408d SHA-256: 8789dbcafb3654005055dfc7a7af01dd237b4339e3d974162a22a46089e213ff

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to other PDF files hosted on static.usrfiles.com. One of these links, https://ttraff.cc/wix?keyword=patofisiologi+anemia+megaloblastik+pdf, is identified as a known malicious redirector. This suggests the document is part of a link farm designed to direct users to malicious content, potentially for phishing or malware distribution.

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.cc/wix?keyword=patofisiologi+anemia+megaloblastik+pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/724bd4_9b695894b15b47c28cfe0f4ad76d0b52.pdf
- https://static.usrfiles.com/ugd/b8c837_57ff512707e844248063155b12a8eefa.pdf
- https://static.usrfiles.com/ugd/0dcf4b_06b9ef25dee34248940338312a29685e.pdf
- https://static.usrfiles.com/ugd/b8c837_623b77815142466584cc69fe5b4dead3.pdf
- https://static.usrfiles.com/ugd/b8c837_30bda6cbade347fe9b4b4577d96426f8.pdf
- https://static.usrfiles.com/ugd/b8c837_30a319ecbfb8443d8351d97a3c243ee1.pdf
- https://static.usrfiles.com/ugd/b8c837_740894a2559842da8337605579bd9dab.pdf
- https://static.usrfiles.com/ugd/26481d_664074adc2d34da68429c581f309b3a2.pdf
- https://static.usrfiles.com/ugd/277b62_4912cdb61c044b68be6beeccc0d70409.pdf
- https://static.usrfiles.com/ugd/b77b08_450bac768263489b959df8a4896bb5da.pdf
- https://static.usrfiles.com/ugd/856cea_40e0cedd59f0423998143aec9dadff95.pdf
- https://static.usrfiles.com/ugd/10a4aa_e9a2f9b3020d4eb78de845e17f8db724.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_off00005de9.bin` `5425546c68a9153e42334e6701a8c119b561ff42d314946152f876824cca8571`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5DE9	5472 bytes
`font_01_sfnt_off0000706e.bin` `b4e28bcd20fe8c526dbd83f6b3a805ce44719c3ff9f4edbbdb7a6a26cfb0796e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x706E	9880 bytes

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