PDF malware analysis — malicious · 0bb9fda4a879f89f

MALICIOUS

PDF

38.8 KB Created: 2020-09-01 04:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 420403b6109428ed9a3543f97d5e048f SHA-1: d76565aa492a96e1003333da5e49d21a0791a747 SHA-256: 0bb9fda4a879f89fcfdebd44bdb277043413be7dc499b817433abafa8a370d56

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially obfuscated, includes a URL that appears to be part of a link farm designed to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be luring users to external, potentially malicious, websites.

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.ru/wix?keyword=como+transformar+alqueires+em+metros+quadrados
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/a48928_04c78dcb78ba4d9a9e719ed5d8537d21.pdf
- https://static.usrfiles.com/ugd/cafc24_3a12d7f7b6034556af1919412f3bb9e0.pdf
- https://static.usrfiles.com/ugd/b8c837_fee71b3bd88146f2b0e4431291e2abf5.pdf
- https://static.usrfiles.com/ugd/b8c837_e51eb82ffb154d6ea71517379899237c.pdf
- https://cdn.shopify.com/s/files/1/0431/3051/9716/files/46832319850.pdf
- https://cdn.shopify.com/s/files/1/0440/3704/6422/files/rational_inequalities_worksheet.pdf
- https://cdn.shopify.com/s/files/1/0430/4817/3722/files/entrepreneurship_lecture_notes_free.pdf
- https://cdn.shopify.com/s/files/1/0432/2826/6654/files/wajotivopavupuxuk.pdf
- https://cdn.shopify.com/s/files/1/0429/2440/8988/files/prime_factorization_worksheet.pdf
- https://cdn.shopify.com/s/files/1/0433/9934/8389/files/96615542508.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_off0000560a.bin` `779e04b0dbfc363be23231634499d8e68551f544e113bdfd34884a16557d1eae`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x560A	5084 bytes
`font_01_sfnt_off0000672e.bin` `97898f0002fa864317b722f2869ba57009a4648ac8014ff7525cb75010e9ac7c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x672E	12500 bytes

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