PDF malware analysis — malicious · 7950b339aa3b6bd6

MALICIOUS

PDF

41.9 KB Created: 2020-09-02 11:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 0bc48bb881e86d3527e873723242d0c7 SHA-1: 80d54f99340cbacd832bc93a14ffac1bdaab7278 SHA-256: 7950b339aa3b6bd6f706e819f4c4179994c2934f9c60f9a6121d92b7a92fcd27

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the primary malicious URL. The ML classifier strongly flagged this PDF as malicious, suggesting a high likelihood of malicious intent, likely related to SEO link farming or phishing.

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=the+apology+poem+questions+and+answers
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/b8c837_4adedca71c6249a7bcc29ecf813a5d93.pdf
- https://static.usrfiles.com/ugd/9c0842_890941ac21fa4c90b4223b3ba24e539c.pdf
- https://static.usrfiles.com/ugd/4479ed_cd5f021217354db0af3eb6602b73717d.pdf
- https://static.usrfiles.com/ugd/ceb2e8_a105e6c746ca43a68981d696143b7a1b.pdf
- https://static.usrfiles.com/ugd/c6ac46_9ec742a2dba04793a011db3a67ecba7c.pdf
- https://cdn.shopify.com/s/files/1/0433/9141/8518/files/30110475559.pdf
- https://static.usrfiles.com/ugd/b8c837_13069e5ea59e426e91a94cabcaab5760.pdf
- https://static.usrfiles.com/ugd/857e61_719ab0f157c1436fb98a5db147f6fde5.pdf
- https://static.usrfiles.com/ugd/469aea_86ade294174a4bd1a1daeced6b6fe7f8.pdf
- https://static.usrfiles.com/ugd/d78803_7b10688371e74d4dbfbe9e5911c74ee4.pdf
- https://static.usrfiles.com/ugd/5c9621_e7966a023d694beeab7783c27c1105de.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_off000063d5.bin` `eeea7e396bae2c042e28a8d7754e0e141db7df2e376ff67d411b0c21a7f4ff5f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x63D5	5644 bytes
`font_01_sfnt_off000076e6.bin` `305d53da90a2d1c1f80ad5b02fe0adc3245922f088bf49b4addccfeb75418cd3`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x76E6	10256 bytes

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