PDF malware analysis — malicious · 7d635b62f5cf936b

MALICIOUS

PDF

40.4 KB Created: 2020-08-12 06:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: fb6ecf6bda00f2ea9b9b08b2cb895f74 SHA-1: f442eda9c1a22c15377027b85cd2dee9c26b3f5c SHA-256: 7d635b62f5cf936b305ca99d50f1317812671bb345a8d151c35a61ae0c72318c

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a redirector to malicious infrastructure, disguised as a whistleblower complaint. The embedded URLs suggest an attempt to distribute further malicious content or phishing pages. The ML classifier strongly indicates malicious intent.

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/wb?keyword=whistleblower%20complaint%20pdf%20text
- http://files.bargeadhesive.com/uploads/1/3/1/8/131856907/fabagumijow.pdf
- http://files.shenandoahpiper.com/uploads/1/3/0/7/130740183/gorusubegaj.pdf
- http://files.mspledgersclass.com/uploads/1/3/2/8/132814969/pitofatezowi_kirewogaw_pilobevelew_vobumaz.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://cdn.shopify.com/s/files/1/0431/3418/9734/files/zutuwozir.pdf
- https://cdn.shopify.com/s/files/1/0429/6255/0940/files/gaxajitinumeve.pdf
- https://cdn.shopify.com/s/files/1/0436/5202/2430/files/riximevakomobajetefi.pdf
- https://cdn.shopify.com/s/files/1/0431/2150/8506/files/xokedab.pdf
- https://cdn.shopify.com/s/files/1/0429/2047/6828/files/15016108291.pdf
- https://cdn.shopify.com/s/files/1/0435/7931/0239/files/j4_pro_builds.pdf
- https://cdn.shopify.com/s/files/1/0434/6239/4021/files/savep.pdf
- https://cdn.shopify.com/s/files/1/0438/8909/8907/files/geduwalozetasozomobe.pdf
- https://cdn.shopify.com/s/files/1/0428/2764/5084/files/24544598162.pdf
- https://cdn.shopify.com/s/files/1/0433/4311/8495/files/trumpet_tune_henry_purcell.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_off00005e77.bin` `faecb23133d6bd0187fbfb986251417bd8ccc270ef812142bd85311525a2e32a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5E77	5708 bytes
`font_01_sfnt_off000071ca.bin` `d3bb4d9d223d941a100419776e903b1098f291914b5cbb6e372188030b70bad8`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x71CA	10352 bytes

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