PDF malware analysis — malicious · 40f118de916189d3

MALICIOUS

PDF

51.2 KB Created: 2020-08-30 23:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: f94c3cdedcab88b46ff395066ac922e4 SHA-1: 336fbf4f551dfa8972c5d20ffb68cc254e4db1ca SHA-256: 40f118de916189d319ffeeb3185ee3cde7e7d3da459fadf6dad7a4066ca2491b

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link leads to a URL that is part of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

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=employment+contract+renewal+letter+sample+doc
- https://cdn.shopify.com/s/files/1/0429/2355/7030/files/zizajozogekokugobagabol.pdf
- https://cdn.shopify.com/s/files/1/0437/6539/9713/files/karavigajorisija.pdf
- https://cdn.shopify.com/s/files/1/0435/3694/1215/files/58568412389.pdf
- https://cdn.shopify.com/s/files/1/0433/5350/5946/files/vejefiwoduxamov.pdf
- https://cdn.shopify.com/s/files/1/0437/8594/5246/files/lobar_functions_of_brain.pdf
- https://static.usrfiles.com/ugd/b8c837_3b11887d8f7c40c7922343d1fcf48a53.pdf
- https://static.usrfiles.com/ugd/b8c837_04b691418b70453aa3f836a0939145b7.pdf
- https://static.usrfiles.com/ugd/fd7405_f5a4cf8246974897bf363cc1a8248f9d.pdf
- https://cdn.shopify.com/s/files/1/0431/9277/8912/files/xovojoxunile.pdf
- https://cdn.shopify.com/s/files/1/0432/9121/3988/files/ragokifefofarebegubat.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00007f2f.bin` `85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7F2F	2828 bytes
`font_01_sfnt_off00008929.bin` `47734de43aab7cb9cf0bc4ad0bb000191a430bf9d9cd1511bc51abf51691f0f6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8929	5372 bytes
`font_02_sfnt_off00009b67.bin` `13100c61f25381a40ad84de5c374981dbf5e4f9044f05e5075af86b6a18833e6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9B67	9848 bytes

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