PDF malware analysis — malicious · 5e95791c27fe72e6

MALICIOUS

PDF

69.2 KB Created: 2020-08-19 08:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 75c539d49c354480cc9e2ff8c3d5df53 SHA-1: 98356457f03c74c8d7a41e158f2b27f01bb8c90d SHA-256: 5e95791c27fe72e69ea3e44ad39c141845d9386b06443e48aeafa3bf641e1408

194 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The sample is a PDF that contains a mass of external links, including one to a known malicious redirector. It also presents a fake CAPTCHA to trick the user into clicking the malicious link. The ML classifier strongly indicated maliciousness, supporting the observed behaviors.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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.
Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA

Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
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/pify?keyword=cleverbot+creepy+answers
- http://jusujak.sochepics.com/uploads/1/3/1/6/131607600/8180156.pdf
- http://segar.wanyunshao.com/uploads/1/3/1/4/131483400/9925815.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://cdn.shopify.com/s/files/1/0429/2696/4895/files/jazogudomozidotasaxe.pdf
- https://cdn.shopify.com/s/files/1/0434/8837/9032/files/9113830302.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xidab.pdf
- https://cdn.shopify.com/s/files/1/0437/1510/0826/files/fivirujoguro.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sigejorivuzogekos.pdf
- https://cdn.shopify.com/s/files/1/0436/5864/1573/files/4832238203.pdf
- https://cdn.shopify.com/s/files/1/0432/4953/3088/files/56047778236.pdf
- https://cdn.shopify.com/s/files/1/0431/3556/5978/files/xagirodofixazesus.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_off0000d255.bin` `26cf3c5726e5ff0ce8d31d8fe08ffaa4583dc9979c560ccbb7d5aa56cba267b5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD255	5224 bytes
`font_01_sfnt_off0000e439.bin` `0e300abe8b469d3369abe4992d3110d26f18c98f9d7a3340847315dee75c1a2a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE439	10540 bytes

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