PDF malware analysis — malicious · 4b4ac2bd6013041e

MALICIOUS

PDF

44.7 KB Created: 2020-08-30 20:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: c76ac2cfcc63237ee8772c3a42b42339 SHA-1: d59243639dd274f3cb6c37d2a71f1a26eacb5066 SHA-256: 4b4ac2bd6013041e9fb8c2e3f9078d0a9543504193cef6dea663110aa5d7c2f8

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a large number of external links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which is likely the intended destination for users clicking on links within the document.

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=ejemplos+de+lenguaje+comun+a+lenguaj
- https://cdn.shopify.com/s/files/1/0430/5957/6986/files/information_security_interview_questions_and_answers.pdf
- https://cdn.shopify.com/s/files/1/0434/2461/2508/files/84565548255.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87899810879.pdf
- https://static.usrfiles.com/ugd/b8c837_fba2452068a84ca7a8008921feeaa2fe.pdf
- https://cdn.shopify.com/s/files/1/0437/6471/1575/files/zugufalo.pdf
- https://cdn.shopify.com/s/files/1/0459/2553/1815/files/barber_shop_game_mod_apk.pdf
- https://static.usrfiles.com/ugd/a298ce_11ff8ccc53e94c808e93f7de42cce498.pdf
- https://static.usrfiles.com/ugd/a4e402_3fccd1d4807c420393a07dbd534885f0.pdf
- https://static.usrfiles.com/ugd/b8c837_6aae4917859e4932aac2d8b100caaea6.pdf
- https://static.usrfiles.com/ugd/4c76bf_08abd8b96435405eaa8be503c234eec1.pdf
- https://static.usrfiles.com/ugd/b8c837_6e47c7c7d1a6442d8ebdcdc9369fa4d1.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00006595.bin` `3b023bb538f6721eb22db78bd044fc337491eb3d28876e67c1f5ef72a6baafad`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6595	5328 bytes
`font_01_sfnt_off000077ac.bin` `5b6ff97671937004ff8a77fa332bedfda3c7be933ba57c5436e5148a8567dadd`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x77AC	14808 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.