PDF malware analysis — malicious · 30689b9ebecfb4c1

MALICIOUS

PDF

39.8 KB Created: 2020-07-30 16:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: df5c1d5ebeb6a9e446da477047913d79 SHA-1: 4c0dcd42657d4a75b1b31440d9d2a80db3c80af2 SHA-256: 30689b9ebecfb4c15db6f934f1e20b8a89779020cccc50bbff380cd10fea7bf9

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a large number of embedded links, with a significant portion pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to a 'Pequeno catecismo catolico pdf'. The presence of PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics strongly indicates a malicious intent to redirect users to harmful sites. The ML classifier also flagged this PDF with high confidence.

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/pify?keyword=pequeno+catecismo+catolico+pdf
- http://files.faithisfamily.org/uploads/1/3/0/7/130776267/7126b.pdf
- http://files.symmetry-careers.com/uploads/1/3/1/4/131454699/razulil.pdf
- http://files.standupstudios.com/uploads/1/3/0/7/130739696/3399f7.pdf
- https://cdn.shopify.com/s/files/1/0439/0410/6651/files/tufizetekogibode.pdf
- https://cdn.shopify.com/s/files/1/0437/7152/7325/files/12834941818.pdf
- https://cdn.shopify.com/s/files/1/0430/1747/0101/files/44440023431.pdf
- https://cdn.shopify.com/s/files/1/0432/5507/0880/files/vegebivived.pdf
- https://cdn.shopify.com/s/files/1/0429/8512/8099/files/53482760137.pdf
- https://cdn.shopify.com/s/files/1/0431/7249/5524/files/sotixajume.pdf
- https://cdn.shopify.com/s/files/1/0431/0381/3781/files/xiketujezifem.pdf
- https://cdn.shopify.com/s/files/1/0431/4054/6721/files/78571278125.pdf
- https://cdn.shopify.com/s/files/1/0432/8076/0990/files/gasafagowezakonipotiduxap.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/
- https://cdn.shopify.com/s/f

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00005eb3.bin` `7e8bed1be36042c99e53dff04d093248223e454e89b7a0299f40cd01ea990876`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5EB3	5216 bytes
`font_01_sfnt_off0000705a.bin` `f50c8ca01d14d47f658f4425c358ec7fc0fccc3b1c56da0d21541967de321667`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x705A	9896 bytes

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