PDF malware analysis — malicious · df5edcb0243a1803

MALICIOUS

PDF

34.6 KB Created: 2020-08-30 23:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: ec0f3435fa5972eeb06c188c91906655 SHA-1: 3073672b055bfbd4c7fe1a0244945433412fa2ac SHA-256: df5edcb0243a180364a37d62ddde8f7dce9da905ca2ab9873f77c1305adf7d45

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics and IOCs. The presence of multiple external PDF links suggests a link farm or SEO poisoning tactic to distribute malicious content.

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=atlas+de+hematologia+clinica+rodak+pdf
- https://static.usrfiles.com/ugd/b8c837_4435acaf8f07454098913d9b1539bec5.pdf
- https://static.usrfiles.com/ugd/b8c837_c9204ac282bf45bc993e2c3fc17378d7.pdf
- https://static.usrfiles.com/ugd/1d64af_aca0bb51108b435d97ea9040ccfd9edf.pdf
- https://static.usrfiles.com/ugd/c7a620_657b04c072d14641bf65304ec245fd3d.pdf
- https://cdn.shopify.com/s/files/1/0432/6244/3683/files/82056490668.pdf
- https://static.usrfiles.com/ugd/b8c837_997ae683a9c349bf93a1d04be82e9c43.pdf
- https://static.usrfiles.com/ugd/64d889_2b8ead370b8747b8b859da030cfa30d0.pdf
- https://static.usrfiles.com/ugd/8cbfce_c4b9a23e81eb4e84bb55787e12fb319d.pdf
- https://static.usrfiles.com/ugd/c63dba_7ce455c4be3d4c1ebcea0c0960143325.pdf
- https://static.usrfiles.com/ugd/5ed537_62fec4d3da0e4bbab1cda8b2a138aed9.pdf
- https://static.usrfiles.com/ugd/4bb894_cdce1af91e174400807639a2768b33df.pdf
- https://static.usrfiles.com/ugd/b8c837_a4ef5ad615cc40d399cde0dc95359476.pdf
- https://static.usrfiles.com/ugd/90c678_5044a3a83aba4d2dba1db7b0b2b2fe62.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_off00004a29.bin` `c4dcdccb78ca485f93ff5a3474f7007eaf700a47eece936d35f443f3dc489427`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4A29	5624 bytes
`font_01_sfnt_off00005d1c.bin` `aa61bda539f3807e69489f9aad59ca8e72b802c6426302407ce92cd0a16ae11b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5D1C	9660 bytes

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