PDF malware analysis — malicious · ec1e1d0eb131d5eb

MALICIOUS

PDF

50.8 KB Created: 2020-08-30 00:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: c8e2c1aa538d69491348f4f5921d2682 SHA-1: 2a8862622cb9b3e7c8ad89c6d255b9218ddfb3a7 SHA-256: ec1e1d0eb131d5eb306fc7f27d3a36cbea658528f8cd4dc49d3f6c6af88f72b2

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to a malicious domain, disguised as a book PDF. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and the embedded URL confirm this redirection. The ML classifier also flagged this PDF with high confidence. The document body, though heavily corrupted, contains fragments of the target URL and references to 'book pdf', supporting the lure.

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=meditations+marcus+aurelius+book+pdf
- https://cdn.shopify.com/s/files/1/0437/8807/5159/files/pals_provider_manual.pdf
- https://cdn.shopify.com/s/files/1/0427/9622/0572/files/ruvunekaxavofetuxa.pdf
- https://cdn.shopify.com/s/files/1/0428/2250/0518/files/totenodapebo.pdf
- https://static.usrfiles.com/ugd/e2f7e1_39fbb4f36128481db168e3b611fdeaa9.pdf
- https://static.usrfiles.com/ugd/cac9e4_2622f46c19774a6cb1184431b94b55e6.pdf
- https://static.usrfiles.com/ugd/e5a943_6ac1814965254e718ab2a5e200051149.pdf
- https://static.usrfiles.com/ugd/b8c837_3b85c4984ff244058e65dd367f31e851.pdf
- https://static.usrfiles.com/ugd/b8c837_1b66c7751e714042a13b12e666979b85.pdf
- https://static.usrfiles.com/ugd/80c1db_bbf548e7c79e445495a6beb9e3c9ffae.pdf
- https://static.usrfiles.com/ugd/fa6f14_49419a8b1ce349e7938e7116dbf799bb.pdf
- https://cdn.shopify.com/s/files/1/0432/5657/8212/files/bekodoresifipabalu.pdf
- https://cdn.shopify.com/s/files/1/0439/2845/3288/files/bujerixiferalizavanunoza.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_off000089b6.bin` `52c6901467d27de66f4bedfe1424dd12642f4c37a870af022df8ef22ef94482b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x89B6	5508 bytes
`font_01_sfnt_off00009c5e.bin` `4a00a92eceaf12329a88cc814e39522239f6f7c0cf59bc4471fd74d7658eb6e8`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9C5E	10024 bytes

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